add docker build instruction

docker-compose.yml

@@ -4,16 +4,11 @@ services:
   python:
     image: "poetry-python:latest"
     container_name: 'poetry-python'
+    user: ${USER}
     build:
       context: .
       dockerfile: Dockerfile
       args:
         - USER=${USER}
     volumes:
-      - ./poetry/:/poetry/
-    command: >
-      bash -c "
-      cp /code/* /poetry -r
-      && sleep 2
-      && chown ${USER}:$USER -R /poetry
-      "
+      - ./poetry/:/poetry/