fix(CI): 移除build_args及custom_dns

.drone.yml

@@ -24,10 +24,6 @@ steps:
       # create the docker_username and docker_password secrets in Drone, with Nexus' username & password
       secrets: [ drone, dronepw ]
       storage_driver: vfs    #解决群晖btrfs,而docker内用的是vfs
-      build_args:
-        HTTP_PROXY=http://192.168.31.254:7890 
-        HTTPS_PROXY=http://192.168.31.254:7890
-      custom_dns: 8.8.8.8
     volumes:
       - name: dockersock
         path: /var/run/docker.sock