build: automatically cancel old tests/build on new push (#1545)

Currently, whenever you push any commit to your branch, the old builds are still running and a new build is started. Once a new commit is added, the old test results no longer matter and it's just a waste of CI resources. Also reduces confusion with multiple builds running in parallel for the same branch/possibly blocking any merges.

With this little change, we ensure that whenever a new commit is added, the previous build is immediately canceled/stopped and only the build (latest commit) runs.

Author: kevcodez

.github/workflows/tests.yml

@@ -16,6 +16,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   tests:
     name: Tests