[2d] Ditch bazel in dotmesh builds

[Godley]

Reasons to keep bazel

• it's quick

Reasons to get rid of bazel

• error messages are opaque so debugging it can be a pain
• it's different to the tooling elsewhere wherein you can mostly just run docker build -t componentname . to get a build
• we never managed to get rid of docker completely so it's not as quick as we'd like
• builds don't work on the prod server (probably a good thing since it forces us to use a tagged build...)

Would like to talk about this in an engineering meeting maybe. Since we already have a build_in_container_without_bazel which is quicker than the old docker script, it shouldn't be too much work stripping it out where it's used.

[Godley]

TODO: look into whether there's a way to statically link golang images using a minimal golang build image. Previously we did this using ubuntu, if we don't do this now we probably need to switch from scratch to alpine for our running images.