make port changeable through env

.env.example

@@ -1,4 +1,5 @@
 API_KEY=apiKey
+PORT=
 
 TIDAL_HOST=http://localhost
 TIDAL_PORT=47836

src/config.ts

@@ -4,6 +4,7 @@ dotenv.config();
 
 export const Config = {
   api_key: process.env.API_KEY,
+  port: process.env.PORT || "8080",
 
   tidal: {
     host: process.env.TIDAL_HOST || "",

src/index.ts

@@ -141,10 +141,13 @@ server.register(
   { prefix: "/api" },
 );
 
-server.listen({ port: 8080, host: "0.0.0.0" }, (err, address) => {
+server.listen(
+  { port: parseInt(Config.port, 10), host: "0.0.0.0" },
+  (err, address) => {
     if (err) {
       console.error(err);
       process.exit(1);
     }
     console.log(`Server listening at ${address}`);
-});
+  },
+);