Update #! in shell scripts (apache#8076)

Some new distributions like nix and guix have stressed the definition of posix compliance and do not provide `/bin/bash`, breaking pulsar builds for these distros. This PR applies the most straightforward fix, as `/usr/bin/env` is posix.

Note for those searching in the future: there are still issues with nix builds relating to [this ridiculousness](https://discourse.nixos.org/t/runtime-alternative-to-patchelf-set-interpreter/3539), but that's truly a nix issue, not pulsar.

Author: seeday

dashboard/django/collector.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

dashboard/init-postgres.sh

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-#!/bin/bash
+#!/usr/bin/env bash
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 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

dashboard/start.sh

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-#!/bin/bash
+#!/usr/bin/env bash
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 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/build.sh

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-#!/bin/bash
+#!/usr/bin/env bash
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 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/get-version.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/grafana/start.sh

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-#!/bin/bash
+#!/usr/bin/env bash
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 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/publish.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/pulsar/scripts/generate-zookeeper-config.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/pulsar/scripts/pulsar-zookeeper-ruok.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

docker/pulsar/scripts/set_python_version.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker-build.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker-format.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker-tests.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/alpine/build-wheel-file-within-docker.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/alpine/build-wheel.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/build-client-lib-within-docker.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/build-client-lib.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/build-wheel-file-within-docker.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/build-wheels.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/create-images.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/docker/push-images.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/apk/build-apk.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/apk/docker-build-apk.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/deb/build-deb.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/deb/build-docker-image.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/deb/docker-build-deb.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/rpm/build-docker-image.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/rpm/build-rpm.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pkg/rpm/docker-build-rpm.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pulsar-test-service-start.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/pulsar-test-service-stop.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/python/pkg/osx/generate-all-wheel.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/python/pkg/osx/vagrant-build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/run-unit-tests.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-client-cpp/travis-build.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-common/generate_protobuf.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-common/generate_protobuf_docker.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

pulsar-functions/submit-python-function.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/build-site.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/docker-build-site.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/doxygen-doc-gen.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/generate-api-docs.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/javadoc-gen.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/publish-website.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/pulsar-admin-doc-gen.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

site2/tools/python-doc-gen.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

src/gen-swagger.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

src/rename-netty-native-libs.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

src/set-project-version.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

src/sign-release.sh

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-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file

src/stage-release.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file