Recently a user and bd808 reported that the job builder is failing.
The cause seems to be harbor, which has some flapping services:
```
harbor-core /harbor/entrypoint.sh Restarting
harbor-exporter /harbor/entrypoint.sh Up
harbor-jobservice /harbor/entrypoint.sh Restarting
harbor-log /bin/sh -c /usr/local/bin/ ... Up (healthy) 127.0.0.1:1514->10514/tcp
harbor-portal nginx -g daemon off; Up (healthy)
nginx nginx -g daemon off; Up (healthy) 0.0.0.0:80->8080/tcp, 0.0.0.0:9090->9090/tcp
redis redis-server /etc/redis.conf Up (healthy)
registry /home/harbor/entrypoint.sh Up (healthy)
registryctl /home/harbor/start.sh Up (healthy)
```
Occasionally those 'restarting' services switch to "Up (health: starting)" and then drop back into 'restarting.
Initially we assumed that this was an issue with the recent builds-builder upgrade (resulting in a revert, and then a reverted revert.)