Docker apparently is not available on ubuntu-slim

Author: mhucka

.github/workflows/ci.yaml

@@ -91,7 +91,7 @@ jobs:
 
   docker-lint:
     name: Dockerfile lint checks
-    runs-on: ubuntu-slim
+    runs-on: ubuntu-24.04
     timeout-minutes: 15
     steps:
       - name: Check out a copy of the git repository