Fix non-resolvable dependencies in builds

[spikymonkey]

App Broker is pulling some artifacts repo.spring.io which which will soon no longer be available anonymously. As part of the phased lockdown of that repository there have been scheduled 'brownout' days - we hit one today and noticed builds failing. We also seem to have problems installing the cf CLI in our base image docker builds. We should put scheduled builds in place for these images so that we notice them going stale more quickly.

[spikymonkey]

Ah the cf CLI problem is because no arm64 package is published, and I'm building locally on an M1 mac.