Release CI with nightlies

.github/actions/download/action.yml

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+name: 'Download artifact'
+description: 'Donwload artifacts with normalized names'
+inputs:
+  name:
+    required: true
+    type: string
+  path:
+    required: true
+    type: string
+
+runs:
+  using: "composite"
+  steps:
+    - name: Normalise name
+      run: |
+        name=${{ inputs.name }}
+        echo "NAME=${name//\//_}" >> "$GITHUB_ENV"
+      shell: bash
+
+    - name: Download artifact
+      uses: actions/download-artifact@v4
+      with:
+        name: ${{ env.NAME }}
+        path: ${{ inputs.path }}
+

.github/actions/upload/action.yml

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+name: 'Upload artifact'
+description: 'Upload artifacts with normalized names'
+inputs:
+  if-no-files-found:
+    default: 'error'
+    type: string
+  name:
+    required: true
+    type: string
+  path:
+    required: true
+    type: string
+  retention-days:
+    default: 0
+    type: number
+
+runs:
+  using: "composite"
+  steps:
+    - name: Normalise name
+      run: |
+        name=${{ inputs.name }}
+        echo "NAME=${name//\//_}" >> "$GITHUB_ENV"
+      shell: bash
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v4
+      with:
+        if-no-files-found: ${{ inputs.if-no-files-found }}
+        retention-days: ${{ inputs.retention-days }}
+        name: ${{ env.NAME }}
+        path: ${{ inputs.path }}
+

.github/scripts/build.sh

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+#!/bin/bash
+
+set -eux
+
+uname -a
+uname -p
+uname
+pwd
+env
+
+if [ "${RUNNER_OS}" = Windows ] ; then
+    ext=".exe"
+else
+    ext=""
+fi
+
+ghcup --no-verbose install ghc --set --install-targets "${GHC_TARGETS}" "${GHC_VERSION}"
+
+sed -i.bak -e '/DELETE MARKER FOR CI/,/END DELETE/d' cabal.project # see comment in cabal.project
+cabal update
+cabal user-config diff
+cabal user-config init -f
+"ghc-${GHC_VERSION}" --info
+"ghc" --info
+
+# https://github.com/haskell/cabal/issues/7313#issuecomment-811851884
+if [ "$(getconf LONG_BIT)" == "32" ] || [ "${DISTRO}" == "CentOS" ] ; then
+    echo 'constraints: lukko -ofd-locking' >> cabal.release.project.local
+fi
+
+# shellcheck disable=SC2206
+args=(
+    -w "ghc-$GHC_VERSION"
+    --disable-profiling
+    --enable-executable-stripping
+    --project-file=cabal.release.project
+    ${ADD_CABAL_ARGS}
+)
+
+cabal v2-build "${args[@]}" cabal-install
+
+mkdir -p "out"
+# shellcheck disable=SC2154
+cp "$(cabal list-bin "${args[@]}" cabal-install:exe:cabal)" "out/cabal$ext"
+cp dist-newstyle/cache/plan.json "out/plan.json"
+cd "out/"
+
+# create tarball/zip
+TARBALL_PREFIX="cabal-install-$("./cabal" --numeric-version)"
+case "${TARBALL_EXT}" in
+    zip)
+        zip "${TARBALL_PREFIX}-${ARTIFACT}.${TARBALL_EXT}" "cabal${ext}" plan.json
+        ;;
+    tar.xz)
+        tar caf "${TARBALL_PREFIX}-${ARTIFACT}.${TARBALL_EXT}" "cabal${ext}" plan.json
+        ;;
+    *)
+        fail "Unknown TARBALL_EXT: ${TARBALL_EXT}"
+        ;;
+esac
+
+rm "cabal${ext}" plan.json
+

.github/scripts/test.sh

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+#!/bin/bash
+
+set -eux
+
+env
+pwd
+ls -lah
+
+cd out
+case "${TARBALL_EXT}" in
+    zip)
+        unzip ./cabal-install-*-"${ARTIFACT}.${TARBALL_EXT}"
+        ;;
+    tar.xz)
+        tar xf ./cabal-install-*-"${ARTIFACT}.${TARBALL_EXT}"
+        ;;
+    *)
+        fail "Unknown TARBALL_EXT: ${TARBALL_EXT}"
+        ;;
+esac
+cd ..
+
+ghcup --no-verbose install ghc --set --install-targets "${GHC_TARGETS}" "${GHC_VERSION}"
+
+cabal update
+
+# TODO: we want to avoid building here... we should just
+# be using the previously built 'cabal-tests' binary
+cabal run ${ADD_CABAL_ARGS} cabal-testsuite:cabal-tests -- \
+  --with-cabal "$(pwd)/out/cabal" \
+  --intree-cabal-lib "$(pwd)" \
+  --test-tmp "$(pwd)/testdb" \
+  --skip-setup-tests \
+  -j "$(nproc)"
+

.github/workflows/release.yaml

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+name: Build and release
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - 'v*'
+      - 'cabal-install-*'
+  pull_request:
+    branches:
+      - master
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  release-workflow:
+    uses: ./.github/workflows/reusable-release.yml
+    with:
+      branches: '["${{ github.ref }}"]'
+
+  release:
+    name: release
+    needs: [ "release-workflow" ]
+    runs-on: ubuntu-latest
+    if: ${{ startsWith(github.ref, 'refs/tags/') || github.event_name == 'schedule' }}
+    steps:
+      - name: Get current date
+        id: date
+        run: echo "NIGHTLY_DATE=$(date +'%Y-%m-%d')" >> $GITHUB_ENV
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Download artifacts
+        uses: actions/download-artifact@v4
+        with:
+          pattern: artifacts-*
+          merge-multiple: true
+          path: ./out
+
+      - name: Install requirements
+        run: |
+          sudo apt-get update && sudo apt-get install -y tar xz-utils
+        shell: bash
+
+      - name: build sdists
+        run: |
+          cabal sdist -o out all
+        shell: bash
+
+      - name: Release
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: true
+          files: |
+            ./out/*
+
+      - name: Release nightly
+        if: ${{ github.event_name == 'schedule' }}
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: nightly-${{ env.NIGHTLY_DATE }}
+          draft: false
+          prerelease: true
+          files: |
+            ./out/*