fix(ci): handle clean index after git add in projects workflow

.github/workflows/update-projects.yml

@@ -38,12 +38,12 @@ jobs:
 
       - name: Commit and push
         run: |
-          if [[ -z "$(git status --porcelain content/page/projects/index.md)" ]]; then
-            echo "No changes to commit."
-            exit 0
-          fi
           git config user.name "github-actions[bot]"
           git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git add content/page/projects/index.md
+          if git diff --cached --quiet; then
+            echo "No changes to commit."
+            exit 0
+          fi
           git commit -m "chore(projects): refresh projects list"
           git push