Added docker building.

src/main.rs

@@ -25,27 +25,27 @@ async fn main() -> anyhow::Result<()> {
 
     let token_lock = Arc::new(RwLock::new(None));
 
-    let bot_token = token_lock.clone();
-    let server_token = token_lock.clone();
+    [
+        // Spawining bot task
+        tokio::task::spawn(bot::start(args.bot.clone(), token_lock.clone())),
+        // Spawning server task.
+        tokio::task::spawn(error_wrap(server::create(
+            args.server.clone(),
+            token_lock.clone(),
+        )?)),
+    ]
+    .into_iter()
+    // Turning all tasks in unirdered futures set.
+    .collect::<FuturesUnordered<_>>()
+    // Grab first completed future
+    .take(1)
+    // Take the value
+    .next()
+    // Await for it to complete
+    .await
+    // Unwrap (since we can guarantee that it's not empty).
+    // Throw all errors by using ??. First for joining task, second from the task itself.
+    .unwrap()??;
 
-    let web_server = server::create(args.server.clone(), server_token)?;
-    let bot_future = bot::start(args.bot.clone(), bot_token);
-
-    let tasks = [
-        tokio::task::spawn(bot_future),
-        tokio::task::spawn(error_wrap(web_server)),
-    ];
-
-    let completed = tasks
-        .into_iter()
-        .collect::<FuturesUnordered<_>>()
-        .take(1)
-        .collect::<Vec<_>>()
-        .await;
-
-    if let Some(fut) = completed.into_iter().next() {
-        fut?
-    } else {
-        Ok(())
-    }
+    Ok(())
 }