Require Ruby 3.1

[bastelfreak]

Ruby 3.0 and older are dead upstream. Requiring 3.1 or newer allows us to safely use latest gem dependencies. Beaker isn't tied to the Puppet AIO Ruby versions, so we don't need to stay on Ruby 2.6 or 2.7.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.26%. Comparing base (8199309) to head (d627817).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1906   +/-   ##
=======================================
  Coverage   74.26%   74.26%           
=======================================
  Files          79       79           
  Lines        4395     4395           
=======================================
  Hits         3264     3264           
  Misses       1131     1131           

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[bastelfreak]

Tested in voxpupuli/puppet-example#78

[bastelfreak]

So when any gem in a Gemfile requires a Ruby version that's newer than your local Ruby, bundler will stop. it doesn't matter if the Gem group is disabled or not. A simple workaround I came up with (https://github.com/voxpupuli/puppet-example/pull/78/files):

if Gem::Requirement.create('>= 3.1.0').satisfied_by?(Gem::Version.new(RUBY_VERSION.dup))
  group :system_tests do
    gem 'beaker', git: 'https://github.com/bastelfreak/beaker', branch: 'ruby31'
    gem 'voxpupuli-acceptance', '~> 3.0',  :require => false
  end
end

We could easily add this to our modulesync_config. If that's fine for you, we can continue dropping old Ruby/minitar here in beaker.