chore(ci): harden release skip-ci condition for non-push triggers

.github/workflows/release.yaml

@@ -23,7 +23,7 @@ permissions:
 jobs:
   release:
     runs-on: ubuntu-latest
-    if: ${{ !contains(github.event.head_commit.message, '[skip ci]') }}
+    if: ${{ github.event_name != 'push' || !contains(github.event.head_commit.message, '[skip ci]') }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4