build: automatically cancel old tests/build on new push (#1808)

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/check-shellscripts.yml

@@ -7,6 +7,10 @@ on:
   pull_request:
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 permissions:
   contents: read
 

.github/workflows/ci.yml

@@ -6,6 +6,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   check-release-version:
     timeout-minutes: 5

.github/workflows/nix-build.yml

@@ -14,6 +14,10 @@ permissions:
   contents: write
   packages: write
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
 jobs:
   build-run-image:
     strategy: