`compose exec` command is missing about finch HOT 4 CLOSED

Just FYI now the command is implemented in nerdctl in containerd/nerdctl#1598.

Only the --env arg may not work properly which will be fixed in this PR: containerd/nerdctl#1614

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@KoichiKiyokawa, Finch 0.2.0 uses nerdctl 1.1 which supports compose exec command.
example:
finch compose exec service_name pwd

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finch uses nerdctl as upstream. finch forwards the compose commands to nerdctl to perform the task. Currently, compose exec is not supported by nerdctl
Here is the list of commands supported by nerdctl
https://github.com/containerd/nerdctl#command-reference

I marked this issue as an enhancement. May be we can contribute to the nerdctl to implement compose exec.

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@monirul Thank you very much! It helps me a lot!

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