Fix linter workflow

Author: mehr74

.github/workflows/linter.yaml

@@ -33,7 +33,7 @@ jobs:
         run: |
           yamllint --strict .
 
-      - name: YAML linter
+      - name: Dockerfile 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