add chartpress

[minrk]

Uses chartpress to render the chart on each push to main

The kbatch-proxy image is built here, so it is versioned with the chart, solving kbatch-dev/kbatch#42

With this, making a prelease would be:

• (pep440) tag prerelease of kbatch (if needed)
• update appVersion here to match kbatch version
• publish prerelease tag here (does not need to match the kbatch package version)

[minrk]

@yuvipanda I think this is ready to review and test. I can't be 100% sure the publishing will work until it's merged. I tried to run it on my fork, but actions just never run there, despite triggers.

What do you think about separating chart version from appVersion? I think that really simplifies things, but then we have to pick an initial chart version that's not too confusing. I like to pick an arbitrary offset when things like this happens, like starting with 0.101. Or we could leave it at 0.5 and let them diverge naturally.

[yuvipanda]

@minrk letting them diverge is fine.

Or we could leave it at 0.5 and let them diverge naturally.

Let's do this?

You should merge this and iterate as feels appropriate to you!

[minrk]

After a couple fixes, successfully published kbatch-proxy-0.5.0-0.dev.git.34.h37ac17c. I think we're ready to make an 0.5.0b1 with this and kbatch-dev/kbatch#86