Gate music-social issue creation to real music-content additions

[Copilot]

The music-social workflow was generating “New Music Update” issues on any music.html change, including non-musical edits. This PR narrows issue creation to commits that actually add music-related content.

• What changed

  • Switched music-content detection from full diff ($DIFF) to added lines only ($ADDED).
  • Added a job-step guard so the GitHub issue is created only when has_music_content == 'true'.

• Why this matters

  • Prevents noisy automated issues on formatting/layout/metadata-only edits.
  • Keeps social-post prompts aligned with actual new track/mix/release additions.

• Workflow logic update (snippet)

  if echo "$ADDED" | grep -qiE '(audio|track|mix|set|release|soundcloud|youtube)'; then
    echo "has_music_content=true" >> "$GITHUB_OUTPUT"
  else
    echo "has_music_content=false" >> "$GITHUB_OUTPUT"
  fi
  
  - name: Créer une issue "New Music Update"
    if: steps.diff.outputs.has_music_content == 'true'

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[DavidKRK]

✅ Relecture effectuée, c’est bon pour moi.
Le workflow est maintenant bien limité aux vrais ajouts de contenu musical (détection sur lignes ajoutées + garde if avant création d’issue), ce qui corrige le bruit observé sur l’issue #252.