Allow configuring HOST and PORT

.env.example

-ADMIN_USERNAME=
-ADMIN_PASSWORD=
+ADMIN_USERNAME=admin
+ADMIN_PASSWORD=admin
 POSTS_DIR=
 TIDE_SECRET=
-LOGIN_PATH=
+LOGIN_PATH=/login
+HOSTNAME=127.0.0.1
+PORT=8080

src/main.rs

 use dotenv;
 
-use tide::utils::After;
-
 use middleware::*;
+use tide::utils::After;
 
 mod fs;
 mod middleware;
     tide::log::start();
 
     let login_path = std::env::var("LOGIN_PATH").unwrap_or(String::from("/login"));
+    let hostname = std::env::var("HOSTNAME").unwrap_or(String::from("127.0.0.1"));
+    let port = std::env::var("PORT").unwrap_or(String::from("8080"));
     let mut app = tide::with_state(State {
         login_path: login_path.clone(),
     });
         .post(routes::login);
     app.at("/logout").with(require_auth).post(routes::logout);
 
-    app.listen("127.0.0.1:8080").await?;
+    app.listen(format!("{}:{}", hostname, port)).await?;
 
     Ok(())
 }