docker: Bind ./contained/bin for quick updates

Otherwise we'd have to rebuild the image every time

#4 - Investigate extending pr0xy to use SAM

docker-compose.yml

@@ -22,6 +22,7 @@ services:
             - i2pd
         volumes:
             - /tmp/contained:/mount
+            - ./contained/bin:/opt/bin
         networks:
             i2p_net:
                 ipv4_address: 172.16.200.20