ci: improve sync-lockfile workflow - use git-auto-commit-action and add bun cache

Author: dacrab

.github/workflows/sync-lockfile.yml

@@ -17,20 +17,21 @@ jobs:
         with:
           ref: ${{ github.head_ref }}
           token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
 
       - uses: oven-sh/setup-bun@v2
 
+      - uses: actions/cache@v4
+        with:
+          path: ~/.bun/install/cache
+          key: ${{ runner.os }}-bun-${{ hashFiles('bun.lock') }}
+          restore-keys: ${{ runner.os }}-bun-
+
       - run: bun install
 
-      - name: Commit updated lockfile
-        run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add bun.lock
-          if git diff --staged --quiet; then
-            echo "No lockfile changes, skipping commit"
-            exit 0
-          fi
-          git commit -m "chore: sync bun.lock"
-          git pull --rebase origin ${{ github.head_ref }}
-          git push
+      - uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "chore: sync bun.lock"
+          file_pattern: bun.lock
+          commit_user_name: github-actions[bot]
+          commit_user_email: github-actions[bot]@users.noreply.github.com