Create reproducible dev env

[samlaf]

Issue

We don't have a reproducible dev env right now. Some of our make commands implicitly depend on some binaries being installed on the host environment. make go-gen-mocks is one example dependency that caused some issues in a PR, where the repo was using https://github.com/golang/mock as a dependency but I had mockgen go installed from https://github.com/uber-go/mock. Hence running make go-gen-mocks created types that were incompatible with the tests. This is one example, we probably have more.

See #226 (comment) for context.

Solution

We can use nix, or mise, or whatever. Have a preference against devcontainers because I don't like working with them personally.

WIP list of dependencies that we need to track:

• mockgen (make go-gen-mocks is not reproducible right now, see issue section at the top)