Provide Migration / Registration / Debugging Utilities in Docker Image

[onelapahead]

This would allow us remove the bits in the helm chart that download apk packages at runtime. This is a best practice for Docker images and would allow enterprises using the chart / images to use them within their networks where they do not allow for public internet access.

Obviously the chart could simply use different images (however for migrations we take advantage of the fact that the migration are bundled into the firefly image), however I wanted to get the community's feedback on taking the hit in the image size being slightly larger for the sake of operational simplicity.

[codecov-commenter]

Codecov Report

Merging #521 (73a4ef7) into main (2ad92fa) will not change coverage.
The diff coverage is n/a.

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[peterbroadhurst]

Thanks @hfuss - I agree these utilities seem to tip clearly over the usefulness vs. bloat compromise.

I could imagine use maintaining two tag prefixes at some point in FireFly's future, for a runtime vs. utility image. However, I don't think that's justified yet.