Add concurrency configuration

This will cancel in-progress workflows if a PR is updated (i.e., a new commit is pushed) and the same workflows are triggered to run again. This reduces unnecessary compute time.

Author: parkerbxyz

.github/workflows/test.yml

@@ -3,6 +3,10 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   test:
     runs-on: ubuntu-latest