Merge pull request acts-project#859 from niermann999/ref-format-artifacts

ref: Reactivate clang-format artifacts in CI

Author: stephenswat

.github/workflows/checks.yml

@@ -19,3 +19,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Check
         run: .github/check_format.sh .
+      - uses: actions/upload-artifact@v4
+        if: failure()
+        with:
+          name: changed
+          path: changed