allow devcontainers to work with Finch

[kidbrax]

Allow devcontainers to replace Docker with Finch.

Or more specifically, for now the issue seems to be the way vscode gets the docker version. It currently uses 'version --format {{.Server.APIVersion}}'. That command format is not available in Finch. If we could alter the specific command it uses to get the version, Finch "might" work

[chrmarti]

Related: #6014

[weikequ]

I did some investigation here by altering & recompiling finch to output a APIVersion, but in the end, it seems like we might be blocked by the docker socket requirement. See issue linked above.