Merge pull request #6993 from cPu1/fix-merge-release-workflow

Fix merge release workflow when there is nothing to merge

.github/workflows/release-merge.yaml

@@ -19,17 +19,22 @@ jobs:
         with:
           token: "${{ secrets.GITHUB_TOKEN }}"
       - name: Merge release branch into ${{env.DEFAULT_BRANCH}}
+        id: merge-changes
         run: |
           git checkout $DEFAULT_BRANCH
           git checkout -b merge-${{ github.sha }}
-          git merge --no-commit --no-ff ${{ github.ref }}
+          if [ "$(git merge --no-commit --no-ff ${{ github.ref }})" = "Already up to date." ]; then
+            exit 0;
+          fi
           git checkout ORIG_HEAD -- $VERSION_FILE
           git add $VERSION_FILE
           EDITOR=true git merge --continue
           ! git diff --exit-code $DEFAULT_BRANCH...HEAD || exit 1
           git push --set-upstream origin HEAD
+          echo "changes=true" >> $GITHUB_OUTPUT
       - uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 #v6.4.1
         name: Open PR to ${{env.DEFAULT_BRANCH}}
+        if: steps.merge-changes.outputs.changes == 'true'
         with:
           github-token: ${{ secrets.EKSCTLBOT_TOKEN }}
           script: |