`INSTALL_DIND` UDC fails for `docker:dind` image about lib

[alexcb]

I like the idea of adding a --compose-load flag which would simply perform the image loads without the up.

Note that this would not install docker-compose, it would leave it up to the user to provide their own.

[rrjjvv]

Do you have any thoughts around the best/preferred solution? There is a subset of solutions that I'd be willing to implement in some free time.

Roughly speaking, most of the "work around docker:dind" and "work around v2" solutions I'm willing/comfortable implementing. However, the "support v2" solutions would require decisions from you around maintaining/breaking compatibility (so best left to you folks to implement).

(To save you a quick search: docs on compatibility. After migrating our CI infra to v2, we know of at least one other incompatibility not listed in that page, though it's probably not applicable to how Earthly would use it.)