Setup Python and print version in workflow

Add a Setup Python step (actions/setup-python@v6) that uses the PYTHON_VERSION_SHORT env var, and a step to show the Python versions (python --version and py -3 --version) before the Build CPython step. This ensures the runner has the expected Python interpreter available and makes it easier to debug/version-check the environment prior to building and packaging.

Author: FeodorFitsner

.github/workflows/build-python.yml

@@ -104,6 +104,15 @@ jobs:
       contents: write
     steps:
       - uses: actions/checkout@v4
+      - name: Setup Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ env.PYTHON_VERSION_SHORT }}
+      - name: Show Python version
+        shell: pwsh
+        run: |
+          python --version
+          py -3 --version
       - name: Build CPython from sources and package for Dart
         shell: pwsh
         run: |