fix: fix update template workflow

.gitea/workflows/create_update_pr.yml

@@ -6,8 +6,11 @@ permissions:
   pull-requests: write
 
 jobs:
-  test:
+  create_update_branch_and_pr:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
 
     steps:
       - name: Setup Python
@@ -24,9 +27,17 @@ jobs:
     
       - name: Perform update
         run: |
+          set -x
+          git --help
+          msg="$(copier update --trust --defaults --conflict inline 2>&1 | sed -n 1p)"
           branch="chore/update-template-$(python -m uuid)"
-          git checkout -b $branch
-          msg = $(copier update --trust --defaults --conflict inline 2>&1 | sed -n 1p)
+          echo $branch
           git add -A
-          git diff-index --quiet HEAD || git commit -a -m $msg
+          CHANGES=$(git status --porcelain)
+          if [ -z "$CHANGES" ]; then
+            echo "No changes detected"
+            exit 0
+          fi
+          git checkout -b $branch
+          git commit -a -m $msg
           git push -u origin $branch