Update to target HEAD ref (#1088)

* Update workflows

* Update to HEAD ref

.github/workflows/update-portal.yml

@@ -87,7 +87,7 @@ jobs:
 
               echo "==> Push changes..."
               echo "Pushing changes to: $github_pr_repo"
-              git push "https://$GITHUB_TOKEN@github.com/$github_pr_repo.git" "HEAD:$GITHUB_BASE_REF"
+              git push "https://$GITHUB_TOKEN@github.com/$github_pr_repo.git" "HEAD:$GITHUB_HEAD_REF"
 
           else
               echo "No changes found."