docker@default:~/ghost$ docker-compose up -d
Building ghost-app
Step 1/4 : FROM ghost
latest: Pulling from library/ghost
f2b6b4884fc8: Downloading [================================>                  ]  33.95MB/52.61MB
4fb899b4df21: Download complete
c669d5da499d: Download complete
03e8ff4c8721: Download complete
74f934b186cb: Download complete
9d56b49fbc27: Download complete
c2c47add2e97: Download complete
b2306c7b191f: Download complete
6c4bbac4a758: Downloading [===========>                                       ]  22.11MB/97.03MB
385056835ce6: Downloading
bf5961485965: Waiting
ERROR: Service 'ghost-app' failed to build: unauthorized: authentication required