[gcc] Clarify error message.
Issue
@@ -257,7 +257,8 @@ class Gcc:
return docker.from_env()
except docker.errors.DockerException as e:
raise ServiceError(
- f"Failed to initialize docker client needed by GCC environment: {e}"
+ f"Failed to initialize docker client needed by GCC environment: {e}.\n"
+ "Is docker installed?"
) from e
def __call__(
