Add docker detection and lint

docker-compose.yml

@@ -11,3 +11,4 @@ services:
       MAX_PARTY_LINES: '1'
       INITIAL_RUMOR: '...nothing has been said, yet.'
       ENVIRONMENT: 'production'
+      DOCKER: 'true'

server/src/server.ts

@@ -285,5 +285,9 @@ app.delete('/deletePartyLine', [
 
 // Start the server
 app.listen(PORT, () => {
-  console.log(`Rumor Party Line - Running on http://localhost:${PORT}`);
+  console.log(`Rumor Party Line`);
+  console.log(`Internally running on http://localhost:${PORT} in ${process.env.ENVIRONMENT} mode.`);
+  if (process.env.DOCKER) {
+    console.log(`Seems you're running on Docker! Check your external port in the compose file to avoid confusion!`);
+  }
 });