chore(operations): Add git to musl build image

[binarylogic]

This adds git to the musl build image, otherwise CI cannot checkout the code properly.

cc @a-rodin

[binarylogic]

I don't understand why Circle is still complaining that git does not exist 😦

Either git or ssh (required by git to clone through SSH) is not installed in the image. Falling back to CircleCI's native git client but the behavior may be different from official git. If this is an issue, please use an image that has official git and ssh installed.

https://circleci.com/gh/timberio/vector/16540?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

[binarylogic]

@a-rodin I'm having trouble building this image locally. I'm curious how you build this image successfully? I assume you are not on a Mac?

Related, #946 should resolve that, correct? Enabling us to just rebuild the last step in the Docker file.

[ghost]

@binarylogic I build it on Linux, however I suspect that the reason it fails for you is that the Docker VM doesn't have enough RAM allocated to it because linking Clang is rather memory-intensive.

Related, #946 should resolve that, correct? Enabling us to just rebuild the last step in the Docker file.

Yes, it should. In addition, we can unify base builders for x86_64-unknown-linux-musl and armv7-unknown-linux-musleabihf. I was experimenting with the latter recently and was able to compile Vector without default features for armv7-unknown-linux-musleabihf.

[LucioFranco]

VM doesn't have enough RAM allocated to it because linking Clang is rather memory-intensive.

This is the issue, using cgroups directly is much better than going through a VM which docker for mac and windows do.

[LucioFranco]

That said, we can build the toolchain images separately from the dependencies required at build time. This is the goal of #946, so that we don't need to rebuild llvm, clang, rustc each time we want to add git etc.