refactor: load all .env variables

Author: teamchong

docker-compose.yml

@@ -4,8 +4,9 @@ services:
       context: .
       dockerfile: dev.Dockerfile
     environment:
-      - OPENAI_API_KEY=${OPENAI_API_KEY}
       - DISPLAY=host.docker.internal:0.0
+    env_file:
+      - ./.env
     ports:
       - "${PORT:-8000}:8000"
     stdin_open: true