fix: replace actions/setup-python with direct apt-get to prevent container leak

.forgejo/workflows/regenerate-index.yml

@@ -19,17 +19,15 @@ jobs:
           fetch-depth: 2
 
       - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.11'
+        run: |
+          apt-get update -qq && apt-get install -y -qq python3 > /dev/null
+          ln -sf /usr/bin/python3 /usr/bin/python
 
       - name: Check if markdown files changed
         id: check_changes
         run: |
-          # Get list of changed files
           CHANGED_FILES=$(git diff --name-only HEAD^ HEAD)
 
-          # Check if any .md files changed (excluding .docs-index.json)
           if echo "$CHANGED_FILES" | grep -q '\.md$'; then
             echo "md_changed=true" >> $GITHUB_OUTPUT
           else