workflows/test: factor out steps & refactoring

.github/actions/build-foo-cygwin/action.yml

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+name: Build foo.exe
+description: Build foo.exe (on Cygwin)
+inputs:
+  platform:
+    description: Target platform
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        IFS= read -r src_dir <<'EOF'
+        ${{ github.workspace }}
+        EOF
+        echo "$src_dir"
+        src_dir="$( cygpath -ua "$src_dir" )"
+        cd -- "$src_dir"
+        arch=
+        [ '${{ matrix.platform }}' == 'x86' ] && arch=-m32
+        clang++ $arch -std=c++14 -o foo.exe foo.cpp
+      shell: C:\tools\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'

.github/actions/build-foo/action.yml

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+name: Build foo.exe
+description: Build foo.exe
+inputs:
+  platform:
+    description: Target platform
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        $flags = @()
+        if ('${{ matrix.platform }}' -eq 'x86') {
+            $flags += '-m32'
+        }
+        $flags += '-std=c++14','-o','foo.exe','foo.cpp'
+        if ('${{ runner.os }}' -eq 'Linux') {
+            $flags += '-lpthread'
+        }
+        clang++ $flags
+      shell: pwsh

.github/actions/check-cc-cygwin/action.yml

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+name: Check cc/c++
+description: Check cc/c++ (on Cygwin)
+runs:
+  using: composite
+  steps:
+    - run: |
+        check_tool() {
+            local exe
+            for exe; do
+                full_path="$( command -v "$exe" )"
+                echo "$full_path"
+
+                output="$( "$full_path" --version )"
+                echo "$output"
+
+                if ! echo "$output" | grep -F -- "clang version"; then
+                    echo 'Unexpected `'"$exe"' --version` output.' >&2
+                    exit 1
+                fi
+            done
+        }
+
+        check_tool cc
+        check_tool c++
+      shell: C:\tools\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'

.github/actions/check-cc/action.yml

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+name: Check cc/c++
+description: Check cc/c++
+runs:
+  using: composite
+  steps:
+    - run: |
+        function Check-Exe {
+            param(
+                [Parameter(Mandatory=$true)]
+                [string] $Exe
+            )
+
+            echo (Get-Command $Exe).Path
+            $output = & $Exe --version
+            echo $output
+
+            $($output | Select-String -Pattern "clang version" -SimpleMatch -Quiet) -or $(throw "Unexpected `$Exe --version` output")
+        }
+
+        Check-Exe cc
+        Check-Exe c++
+      shell: pwsh

.github/actions/run-foo/action.yml

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+name: Run foo.exe
+description: Run foo.exe and verify its output
+runs:
+  using: composite
+  steps:
+    - run: |
+        $expected = @"
+        Doing something #1
+        Doing something #2
+        Doing something #3
+        "@
+
+        $actual = & (Join-Path . foo.exe)
+        $actual = $actual -join [Environment]::NewLine
+
+        echo @"
+        Expected output:
+        $expected
+        "@
+        echo @"
+        Actual output:
+        $actual
+        "@
+
+        $($actual -eq $expected) -or $(throw "Unexpected output!")
+      shell: pwsh