feat: make check_branch the first step of sync-dev-to-main

Author: xiaoyu2er

.github/workflows/sync-dev-to-main.yml

@@ -15,6 +15,15 @@ jobs:
       merge_success: ${{ steps.merge.outputs.merge_success }}
 
     steps:
+      - name: Check if dev branch exists
+        run: |
+          if git ls-remote --heads https://github.com/${{ github.repository }}.git | grep -q "refs/heads/dev"; then
+            echo "::notice::Dev branch exists, proceeding with sync"
+          else
+            echo "::notice::Dev branch does not exist, skipping sync"
+            exit 1
+          fi
+
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
@@ -26,21 +35,6 @@ jobs:
           git config --global user.name "github-actions[bot]"
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
       
-      - name: Check if dev branch exists
-        id: check_dev
-        run: |
-          if git show-ref --verify --quiet refs/remotes/origin/dev; then
-            echo "dev_exists=true" >> $GITHUB_OUTPUT
-          else
-            echo "dev_exists=false" >> $GITHUB_OUTPUT
-          fi
-      
-      - name: Exit if dev branch doesn't exist
-        if: steps.check_dev.outputs.dev_exists == 'false'
-        run: |
-          echo "Dev branch does not exist. Skipping sync."
-          exit 0
-      
       - name: Check for changes between dev and main
         id: check_changes
         run: |