Add support for docker-compose v2 and private keys

docker-compose.yml

@@ -1,13 +1,16 @@
 # docker-compose.yml example
 
 tor:
-  # image: goldy/tor-hidden-service
+  image: goldy/tor-hidden-service
+  # or
   build: .
   links:
     - hello
     - world
   environment:
       PORT_MAP: 80 # Map port to detected service
+  volumes:
+    - ./keys:/var/lib/tor/hidden_service/
 
 hello:
   image: tutum/hello-world