Fix linter issue, use docker for hadolint

Author: mehr74

.github/workflows/linter.yaml

@@ -35,5 +35,5 @@ jobs:
 
       - name: YAML linter
         run: |
-          podman run --rm -i ghcr.io/hadolint/hadolint < src/grafana/Dockerfile
-          podman run --rm -i ghcr.io/hadolint/hadolint < src/postgres/Dockerfile
+          docker run --rm -i ghcr.io/hadolint/hadolint < src/grafana/Dockerfile
+          docker run --rm -i ghcr.io/hadolint/hadolint < src/postgres/Dockerfile