Cancel obsolete workflows only in PRs

Author: kitsiosk

.github/workflows/codeql-analysis.yml

@@ -16,8 +16,8 @@ permissions:
   contents: read
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.ref }}
-  cancel-in-progress: true
+  group: ${{ github.event_name }}-${{ github.workflow }}-${{ github.head_ref || github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }} # this will cancel only PRs
 
 jobs:
   analyze: