[DOC] Obsolete field in docker-compose.yml

[vladislav-sharapov]

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Tell us about your request. Provide a summary of the request and all versions that are affected.

The docker-compose.yml file has an obsolete field. This causes docker compose commands to show a warning:

$ docker compose config
WARN[0000] ... docker-compose.yml: `version` is obsolete
...

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.

mailcow/mailcow-dockerized#5797
https://docs.docker.com/compose/compose-file/04-version-and-name/

[hdhalter]

Thanks for reporting this, @vladislav-sharapov!

@peterzhuamazon - What should we do with this?