GitHub Actions: cancel outdated jobs (#1550)

Author: mr-c

.github/workflows/ci-tests.yml

@@ -7,6 +7,10 @@ on:
     branches: [ main ]
   workflow_dispatch:
 
+concurrency:
+  group: build-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 env:
   singularity_version: 3.6.4
 

.github/workflows/codeql-analysis.yml

@@ -8,6 +8,10 @@ on:
   schedule:
     - cron: '0 10 * * 2'
 
+concurrency:
+  group: build-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   CodeQL-Build: