Fix broken make pylint

We now stop if any linting fails thereby failing the job if any fail.
Previously the exit code for the job would be "0" if the last linting
succeeded.

Makefile

@@ -26,7 +26,7 @@ push: build
 pylint: build $(PYTHON_COMMANDS)
 	$(foreach file, $(notdir $(PYTHON_COMMANDS)), \
 		echo "Linting $(file)"; \
-		docker run --entrypoint pylint --rm "ghcr.io/${IMAGE}:latest" /commands/$(file); \
+		docker run --entrypoint pylint --rm "ghcr.io/${IMAGE}:latest" /commands/$(file) || exit 1; \
 	)
 
 .PHONY: push