feat(ci): test -core's build in Cryostat image

[mwangggg]

fixes: #221

[mwangggg]

demo: run

[tthvo]

Nice job! Just some questions. Also, why not explore pushing the test image to ghcr.io instead of saving as an aritifacts?

This way, we can output the test image + rerun tests without building too.

[mwangggg]

demo: https://github.com/mwangggg/cryostat-core/actions/runs/6381050918

[aali309]

Looks good to me

[tthvo]

See #266 (comment)

https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache

So, setup-java with cache: maven should cache and restore the -core build in a specific workflow run (i.e. a specific PR). Lets try it out?

[mwangggg]

testing :mwangggg#2

[mwangggg]

/build_test