Review use of docker buildx in CI

[jdolitsky]

The current build takes over 1 hour. Perhaps at the very least the buildx build and push steps can combined?

[cbuto]

@jdolitsky 👀 I was taking a peek at this and planning on putting up a PR with a proposal at some point. I think if we build all the chartmuseum binaries (make cross-build) and copy them into the images (depending on the TARGETARCH), we can speed up the docker builds (which seem to take a lot of time due to having to download the go modules each time).

[scbizu]

@cbuto It seems already existed in Makefile which called make-cross ? We only need to fix our action to use the build-cross and remove the go build in docker build (which no module cache per platform build) and adjust the docker mv command 🤔

[cbuto]

@scbizu yup! that's exactly what I was thinking, I have a branch that is close to working just trying to test it locally 🚀

[cbuto]

The last build took 27m 5s! I tested a few different architectures and everything appears to be working as expected 🎉

[jdolitsky]

phenomenal. Great work @cbuto. think we shall close this for now