ci: simplify auto release workflow guard

Author: Albert-PZY

.github/workflows/auto-release.yml

@@ -1,6 +1,6 @@
 name: Auto Release
 
-on:
+"on":
   push:
     branches: [main]
   workflow_dispatch:
@@ -16,7 +16,6 @@ jobs:
   decide:
     name: Decide release
     runs-on: ubuntu-latest
-    if: ${{ github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'chore(release): prepare ') }}
     steps:
       - name: Checkout
         uses: actions/checkout@v6
@@ -26,9 +25,22 @@ jobs:
       - name: Decide next beta version
         id: version
         shell: bash
+        env:
+          EVENT_NAME: ${{ github.event_name }}
+          HEAD_COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
         run: |
           set -euo pipefail
 
+          if [[ "$EVENT_NAME" == "push" ]]; then
+            case "$HEAD_COMMIT_MESSAGE" in
+              "chore(release): prepare "*)
+                echo "Release preparation commit detected; auto release skipped."
+                echo "publish=false" >> "$GITHUB_OUTPUT"
+                exit 0
+                ;;
+            esac
+          fi
+
           latest_tag=$(git tag --list 'v*-beta.*' --sort=-version:refname | head -n 1)
           if [[ -z "$latest_tag" ]]; then
             echo "No beta tag found; starting from v0.1-beta.1."