Bump setup-python to v6; improve python detection

Update GitHub Actions to use actions/setup-python@v6 in the workflow (added missing setup step and python --version checks). In linux/package-for-linux.sh, replace hard-coded build-path checks with command -v lookups: try python$PYTHON_VERSION_SHORT, then python3, then python. Use empty-string checks instead of -x and update the error message to indicate the host Python interpreter is missing for compileall. These changes make CI use the newer action and make runtime Python detection more robust across environments.

Author: FeodorFitsner

.github/workflows/build-python-version.yml

@@ -79,7 +79,7 @@ jobs:
         shell: bash
         run: |
           echo "PYTHON_VERSION_SHORT=$(echo "$PYTHON_VERSION" | cut -d. -f1,2)" >> "$GITHUB_ENV"
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PYTHON_VERSION }}
       - run: python --version
@@ -113,6 +113,10 @@ jobs:
         shell: bash
         run: |
           echo "PYTHON_VERSION_SHORT=$(echo "$PYTHON_VERSION" | cut -d. -f1,2)" >> "$GITHUB_ENV"
+      - uses: actions/setup-python@v6
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+      - run: python --version
       - working-directory: linux
         shell: bash
         run: |

linux/package-for-linux.sh

@@ -21,15 +21,15 @@ mkdir -p $PYTHON_ARCH/build
 tar zxvf $DIST_FILE -C $PYTHON_ARCH/build
 
 # compile lib
-build_python="$PYTHON_ARCH/build/python/bin/python$PYTHON_VERSION_SHORT"
-if [ ! -x "$build_python" ]; then
-    build_python="$PYTHON_ARCH/build/python/bin/python3"
+build_python=$(command -v "python$PYTHON_VERSION_SHORT" || true)
+if [ -z "$build_python" ]; then
+    build_python=$(command -v python3 || true)
 fi
-if [ ! -x "$build_python" ]; then
-    build_python="$PYTHON_ARCH/build/python/bin/python"
+if [ -z "$build_python" ]; then
+    build_python=$(command -v python || true)
 fi
-if [ ! -x "$build_python" ]; then
-    echo "Python interpreter not found in extracted runtime under $PYTHON_ARCH/build/python/bin"
+if [ -z "$build_python" ]; then
+    echo "Host Python interpreter not found for compileall"
     exit 1
 fi
 "$build_python" -I -m compileall -b "$PYTHON_ARCH/build/python/lib/python$PYTHON_VERSION_SHORT"