Build frappe with Dockerfile

- Build frappe image using development Dockerfile instead of bench:latest image
- Exposing port range

.devcontainer/docker-compose.yml

@@ -19,14 +19,14 @@ services:
     image: redis:alpine
 
   frappe:
-    image: frappe/bench:latest
+    build: .
     command: sleep infinity
     volumes:
       - ..:/workspace:cached
     working_dir: /workspace/development
     ports:
-      - "8000:8000"
+      - "8000-8005:8000-8005"
-      - "9000:9000"
+      - "9000-9005:9000-9005"
 
 volumes:
   mariadb-vol: