🔧 (test-harness.yml): add support for dynamically setting the ref bas…

…ed on the pull request head sha or the current ref to prevent workflow conflicts

.github/workflows/test-harness.yml

@@ -45,6 +45,8 @@ jobs:
         working-directory: src/test/resources/terraform
     steps:
       - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.ref }}
 
       # This action will queue the workflow if another workflow is already running
       - uses: ahmadnassri/action-workflow-queue@v1