WIP

.github/workflows/test.yaml

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+name: "Test"
+
+on:
+  push:
+      branches:
+        - "main"
+
+jobs:
+  test:
+    name: "Test on ${{ matrix.config.os-name }}"
+    runs-on: "${{ matrix.config.runner }}"
+    strategy:
+      matrix:
+        config:
+          - os-name: "Linux"
+            runner: "ubuntu-latest"
+            test-label: "ci-test-linux"
+          - os-name: "macOS"
+            runner: "macos-latest"
+            test-label: "ci-test-macos"
+          - os-name: "Windows"
+            runner: "windows-latest"
+            test-label: "ci-test-windows"
+      fail-fast: false
+
+    steps:
+      - name: "Show environment (pre)"
+        shell: "bash"
+        run: env | sort
+
+      - name: "Checkout"
+        uses: "actions/checkout@v4"
+
+      - name: "Setup Python"
+        id: "setup-python"
+        uses: "actions/setup-python@v4"
+        with:
+          python-version: |
+            3.9
+            3.10
+            3.11
+            pypy-3.9
+          allow-prereleases: true
+
+      - name: "Show environment (post)"
+        shell: "bash"
+        run: env | sort
+
+      - name: "Linux / macOS"
+        id: linux
+        if: "runner.os != 'windows'"
+        shell: "bash"
+        run: 'bash ./finder.sh > "$GITHUB_OUTPUT"'
+
+      - name: "Windows"
+        id: "windows"
+        if: "runner.os == 'windows'"
+        shell: "powershell"
+        run: '& .\finder.ps1 > "$env:GITHUB_OUTPUT"'
+
+      - name: "Show results"
+        shell: "bash"
+        run: |
+          echo "${{ steps.linux.outputs.python-versions }}${{ steps.windows.outputs.python-versions }}"

finder.ps1

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+$all_paths = Get-ChildItem `
+      -Path `
+            "$env:RUNNER_TOOL_CACHE\Python\*\*", `
+            "$env:RUNNER_TOOL_CACHE\PyPy\*\*" `
+      -Filter "x??" `
+      -Directory `
+      | Sort-Object -Property FullName
+
+$paths = @()
+foreach ($path in $all_paths) {
+    if (Test-Path "$path\python.exe") {
+        $paths += $path.FullName
+    }
+}
+
+$output = $paths -join ";"
+Write-Output "python-versions=$output"

finder.sh

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+all_paths=(
+    "$(
+        find \
+            "$RUNNER_TOOL_CACHE/Python" \
+            "$RUNNER_TOOL_CACHE/PyPy" \
+            -mindepth 2 \
+            -maxdepth 2 \
+            -name 'x86' \
+            -o \
+            -name 'x64' \
+        | sort
+    )"
+)
+
+paths=()
+for path in "${all_paths[@]}"; do
+    if [[ -x "${path}/bin/python" ]]; then
+        paths+=("${path}/bin")
+    fi
+done
+
+output=$(echo "${paths[*]}" | tr ' ' ':')
+echo "python-versions=${output}"

identify.py

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+from __future__ import print_function
+
+import sys
+
+
+def main():
+    python_version, _, _ = sys.version.partition(" ")
+    architecture = "x86"
+    if sys.maxsize > 2 ** 32:
+        architecture = "x64"
+
+    # PyPy
+    if hasattr(sys, "pypy_version_info"):
+        implementation = "PyPy"
+        implementation_version = ".".join(str(v) for v in sys.pypy_version_info[:3])
+
+        print(
+            "Python {0} ({1}) [{2} {3}]".format(
+                python_version,
+                architecture,
+                implementation,
+                implementation_version,
+            )
+        )
+
+    # CPython
+    else:
+        print("CPython {0} ({1})".format(python_version, architecture))
+
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())