Ensure Ruby 3 is working for local development

[Adnilson]

Description

Ensure Ruby 3 is working locally by using docker.

• Related Issue / Ticket / Trello card: https://jira.suse.com/browse/SCC-318

How to test

Follow the documentation steps

Change Type

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• Bug Fix (a non-breaking change which fixes an issue)
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• Documentation Update (a change which only updates documentation)

Checklist

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• I have reviewed my own code and believe that it's ready for an external review.
• I have provided comments for any hard-to-understand code.
• I have documented the MANUAL.md file with any changes to the user experience.
• If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

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[baldarn]

LGTM

tested the docker compose up and eveything is running

also natively works on arch with mise

didn't test natively on SUSE distros

[ngetahun]

LGTM!