chore: Ensure only a single workflow using the same branch will run concurrently. (#146)

Author: maniator

.github/workflows/ci.yaml

@@ -6,6 +6,10 @@ on:
     pull_request:
         branches: [main]
 
+concurrency:
+    group: ${{ github.workflow }}-${{ github.ref }}
+    cancel-in-progress: true
+
 jobs:
     unit-test:
         name: Check Format and Run Unit Tests