fix: forgot silly import

Author: mikn

tools/pubsys/src/repo/env_key_source.rs

@@ -1,5 +1,5 @@
 use async_trait::async_trait;
-use log::debug;
+use log::{debug,warn};
 use snafu::Snafu;
 use std::env;
 use tough::key_source::KeySource;