ci: Skip GitHub Release creation on manual workflow triggers

Only create GitHub Releases when triggered by tag push.
Manual workflow_dispatch triggers will build packages but skip release creation.

Entire-Checkpoint: 84b09ae8a281

Author: facontidavide

.github/workflows/release-debs.yaml

@@ -88,6 +88,7 @@ jobs:
 
   release:
     needs: build-deb
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
     permissions:
       contents: write