Added determine-rid test.

Author: PathogenDavid

.gitattributes

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+# Don't attempt end of line normalization on shell scripts
+*.sh -text

.github/workflows/determine-rid.yml

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+name: determine-rid Test
+on: [push, workflow_dispatch]
+jobs:
+  test-unix:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+          - os: ubuntu-arm64-latest
+          - os: macos-latest
+    name: Test ${{matrix.os}}
+    runs-on: ${{matrix.os}}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - run: uname -s
+    - run: uname -m
+    - run: ./determine-rid.sh
+  test-windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows-latest
+    name: Test ${{matrix.os}}
+    runs-on: ${{matrix.os}}
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - run: echo $env:PROCESSOR_ARCHITECTURE
+    - run: ./determine-rid.cmd

determine-rid.cmd

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+@echo off
+setlocal
+
+if not "%FORCE_RID%" == "" (
+    set PLATFORM_RID=%FORCE_RID%
+) else if /i "%PROCESSOR_ARCHITECTURE%" == "AMD64" (
+    set PLATFORM_RID=win-x64
+) else if /i "%PROCESSOR_ARCHITECTURE%" == "ARM64" (
+    set PLATFORM_RID=win-arm64
+) else if /i "%PROCESSOR_ARCHITECTURE%" == "X86" (
+    set PLATFORM_RID=win-x86
+) else (
+    echo Unrecognized processor architecture '%PROCESSOR_ARCHITECTURE%'. Not sure what to use for RID. 1>&2
+    echo You can force a specific RID by setting FORCE_RID. 1>&2
+    exit /B 1
+)
+
+echo %PLATFORM_RID%

determine-rid.sh

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+#!/bin/bash -Eeu
+
+PLATFORM=`uname -s`
+
+function GetRidArchitecture()
+{
+    ARCHITECTURE=`uname -m`
+    if [[ $ARCHITECTURE == 'x86_64' ]]; then
+        echo "x64"
+    elif [[ $ARCHITECTURE == 'aarch64' ]]; then
+        echo "arm64"
+    else
+        echo "Unrecognized processor architecture '$ARCHITECTURE'. Not sure what to use for RID." 1>&2
+        echo "You can force a specific RID by setting FORCE_RID." 1>&2
+        return 1
+    fi
+}
+
+if [[ -n ${FORCE_RID:-} ]]; then
+    echo "$FORCE_RID"
+elif [[ $PLATFORM == 'Linux' ]]; then
+    RID_ARCHITECTURE=`GetRidArchitecture`
+    echo "linux-$RID_ARCHITECTURE"
+elif [[ $PLATFORM == 'Darwin' ]]; then
+    RID_ARCHITECTURE=`GetRidArchitecture`
+    echo "osx-$RID_ARCHITECTURE"
+elif [[ $PLATFORM == MINGW* ]]; then
+    echo "MINGW (and Git Bash) are not supported, use the Windows-specific build scripts instead." >&2
+    exit 1
+elif [[ $PLATFORM == CYGWIN* ]]; then
+    echo "CYGWIN is not supported, use the Windows-specific build scripts instead." >&2
+    exit 1
+else
+    echo "Unrecognized platform '$PLATFORM'. Not sure what to use for RID." >&2
+    echo "You can force a specific RID by setting FORCE_RID." >&2
+    exit 1
+fi