harbor: UI failed to connect to db, retry after 2 seconds... / Bad Gateway

I pulled 864b814 (to test #49 and #59), then cd Deploy, changed hostname = localhost in harbor.cfg. Then I ran docker-compose up -d

Wenn I open http://localhost I get a nginx 502 Bad Gateway error.

The last few lines of /var/log/harbor/<date>/docker_ui.log look like this:

12:41:10 failed to connect to db, retry after 2 seconds...

After a few seconds, deploy_ui container is stopping completely.