docker-compose.yml improvements

1. Enable colorized console outputs
2. Set node environment to production

docker/docker-compose.yml

@@ -4,6 +4,9 @@ services:
     container_name: sillytavern
     hostname: sillytavern
     image: ghcr.io/sillytavern/sillytavern:latest
+    environment:
+      - NODE_ENV=production
+      - FORCE_COLOR=1
     ports:
       - "8000:8000"
     volumes: