Add .env to ignore and remove warning.

.dockerignore

@@ -1,2 +1,3 @@
 assets
 target
+.env

src/util/variables.rs

@@ -1,6 +1,8 @@
-use log::warn;
 use std::env;
 
+#[cfg(debug_assertions)]
+use log::warn;
+
 lazy_static! {
     // General Configuration
     pub static ref MONGO_URI: String =