Fix PR clang-format ref handling

Author: allnes

.github/workflows/ci.yml

@@ -1,5 +1,9 @@
 name: CI
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 on:
   push:
   pull_request:
@@ -16,6 +20,14 @@ jobs:
         fetch-depth: 0
     - name: Install clang-format
       run: sudo apt-get update && sudo apt-get install -y clang-format-18
+    - name: Fetch diff refs
+      env:
+        BASE_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}
+        HEAD_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}
+      run: |
+        if [[ -n "${BASE_SHA}" ]]; then
+          git fetch --no-tags origin "${BASE_SHA}" "${HEAD_SHA}"
+        fi
     - name: Run clang-format
       env:
         BASE_SHA: ${{ github.event_name == 'pull_request' && github.event.pull_request.base.sha || github.event.before }}

.github/workflows/static-analysis.yml

@@ -1,5 +1,9 @@
 name: Static analysis
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 on: [pull_request]
 
 jobs: