Dockerfile -> new ubuntu + ruby3.0

[aschaber1]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Upgrade Dockerfile to use newer Ubuntu release and use ruby 3.0

[aschaber1]

@mortzu , I didn't check the docker build, now I fixed that too. uses newer Ubuntu image and ruby 3.0 now.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dfc6706) 66.40% compared to head (97592e2) 66.40%.

❗ Current head 97592e2 differs from pull request most recent head 60b965e. Consider uploading reports for the commit 60b965e to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2743   +/-   ##
=======================================
  Coverage   66.40%   66.40%           
=======================================
  Files          30       30           
  Lines        1500     1500           
=======================================
  Hits          996      996           
  Misses        504      504           

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