Subo should support systems with docker compose (v2)

[flaki]

I installed Docker from the repository on Ubuntu, side-stepping Docker Desktop, and so I only have docker-compose-plugin which is the new docker compose (note the space).

The docker compose (with a space) is a newer project to migrate compose to Go with the rest of the docker project. This is the v2 branch of the docker/compose repo. It's been first introduced to Docker Desktop users, so docker users on Linux didn't see the command. In addition to migrating to Go, it uses the compose-spec, and part of the rewrite may result in behavior differences.

Apparently this is the way of the future, and subo compute deploy core --local currently fails with an error, not being able to find the old docker-compose command:

⏩ START: preparing deployment
ℹ️  using cached environment token
✅ DONE: ready to start installation
⏩ START: installing...
sh: 1: docker-compose: not found
Error: 🚫 failed to docker-compose up: failed to Run command: exit status 127
Usage:
  subo compute deploy core [flags]

Because alias-es don't work with subo, one actually needs to create a shell shim that re-maps docker-compose to docker compose (and that works because up is the same in both CLI-s), but this is a hassle and is undocumented, so we should at least document it, but it would be better fixing it in subo itself.