The YouTube section update workflow was failing at parse/runtime boundaries, reported as a YAML syntax error around the inline script block. This change makes script execution deterministic by removing shell/YAML ambiguity in that step.

• Workflow execution model

  • Switched the script step from shell: python to shell: bash.
  • Runs Python explicitly through a heredoc, so GitHub Actions parses YAML cleanly and Python receives the script exactly as authored.

• Behavior preserved

  • Kept the existing content-generation logic intact for:
    • music.html YouTube auto-section injection
    • assets/css/style.css conditional YouTube CSS append

• Relevant change

  - name: Injecter les videos et le CSS via Python
    shell: bash
    run: |
      python <<'PY'
      import json
      import re
      import os
      # existing logic unchanged...
      PY