fix: push formatting changes in detached HEAD using github.head_ref

Author: winlinuxmatt

.github/workflows/terraform-lint.yml

@@ -40,7 +40,7 @@ jobs:
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
           git add .
           git diff --cached --quiet || git commit -m "Auto-fix Terraform formatting"
-          git push
+          git push origin HEAD:${{ github.head_ref }}
 
       # Install tfsec
       - name: Install tfsec