feat: Add warning on empty filters

Author: FoxxMD

src/main.rs

@@ -35,6 +35,10 @@ async fn main() -> std::io::Result<()> {
      }
     };
 
+    if config.container_labels.is_empty() && config.container_names.is_empty() {
+        warn!("You have not defined any filters! All containers will be exposed. If you are using docker-proxy-filter only for SCRUB_ENVS then this is expected behavior, otherwise check your environmental variables.");
+    }
+
     let cm = AppStateWithContainerMap {
         container_map: Arc::new(Mutex::new(HashMap::<String, Option<bool>>::new()))
     };

src/utils.rs

@@ -1,5 +1,4 @@
 use crate::config::ContainerLabels;
-use core::num;
 use std::collections::HashMap;
 use tracing::*;