End-to-end Tests to Write

[leostera]

• We can run warp on a new repo and we'll automatically create a Warpfile for it. No complaints.
  • If we're in a subfolder, we'll go up until we find a .git folder that we believe is the root of the repo.
• We can call warp build @all and it'll just queue everything in the workspace.
• warp build @all honors .gitignore
• When running warp build @all, if we find unknown extensions we should just ignore them
• When the network is unreliable, we retry a few times before giving up