Use our container for consistency

Author: Michael Vasseur

.github/workflows/unit-tests.yml

@@ -8,6 +8,8 @@ on:
 
 jobs:
   check-static-codecov:
+    container:
+      image: domjudge/gitlabci:24.04
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4