ci: Refactor conditions to check for branch events

.github/workflows/ci.yaml

@@ -14,8 +14,8 @@ on:
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
-  # Terminate all previous runs of the same workflow and branch, except for main and release branches
-  cancel-in-progress: "${{ !(github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || startsWith(github.ref, 'refs/heads/rel-')) }}"
+  # Terminate all previous runs of the same workflow for pull requests
+  cancel-in-progress: "${{ github.event_name == 'pull_request' }}"
 
 jobs:
   Lint-Style:
@@ -293,7 +293,7 @@ jobs:
 
   Build-Cabal-Arm:
     name: Build aarch64 (Cabal, GHC 9.4.8)
-    if: ${{ github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || startsWith(github.ref, 'refs/heads/rel-') }}
+    if: "${{ github.event_name == 'push' }}"
     runs-on: ubuntu-latest
     outputs:
       remotepath: ${{ steps.Remote-Dir.outputs.remotepath }}