[dockerfile] run getting started steps (ca init) in a separate docker container

[sourishkrout]

Otherwise some subcommands will break

[tashian]

I'm curious how this bug came about? tee is part of Alpine's mini root filesystem, it should be available to any golang:alpine container

[maraino]

@sourishkrout I don't think this is a good idea, we can add tee, but the main problem is that you also need sudo access, and we don't want that.

[maraino]

The command that is failing is not intended to be run on that image, you're supposed to run it on your laptop/desktop. A better solution if we want to run that getting started in docker, would be to create a different image, or create everything using docker-compose.