Build a default pip-capable image?

With docker starting to limit the pulls, we'll soon be running into issues with the various golang:alpine images that we pull for the small ci-fairy jobs (libinput and libevdev use those). mesa uses alpine for 2 jobs as well, xserver and gstreamer don't but there are likely others that need this.

We could have each project build a default alpine image with pip available but it may be worth it having an image with pip and current ci-fairy pre-installed that projects can share?

Thoughts?