Add Ruby 2.7 testing to installer jobs

[ehelms]

No description provided.

[ehelms]

How does this matrix look?

[ekohl]

Can you explain why you no longer use PUPPET_VERSION? AFAIK this is still needed to actually be effective due to https://github.com/theforeman/foreman-installer/blob/8310aa688aefd6a339fa7589834b89d79845c151/Gemfile#L5

[ehelms]

Can you explain why you no longer use PUPPET_VERSION? AFAIK this is still needed to actually be effective due to https://github.com/theforeman/foreman-installer/blob/8310aa688aefd6a339fa7589834b89d79845c151/Gemfile#L5

Simple forgetting that there is an implied environment variable created that the code itself expects.

[ekohl]

In my mind I always start from the bottom. That means going over all modules to ensure they support Puppet 7. Then we can update the check for Puppet 7 here:
https://github.com/theforeman/foreman-installer/blob/8310aa688aefd6a339fa7589834b89d79845c151/spec/puppet_version_spec.rb#L5

I've submitted a bunch of PRs to test on Puppet 7 now:

• Support Puppet 7 puppet-candlepin#178
• Support Puppet 7 puppet-certs#319
• Support Puppet 7 puppet-dhcp#186
• Support Puppet 7 puppet-dns#184
• Support Puppet 7 puppet-foreman#921
• Support Puppet 7 puppet-foreman_proxy#652
• Support Puppet 7 puppet-foreman_proxy_content#333
• Support Puppet 7 puppet-git#74
• Support Puppet 7 puppet-katello#392
• Support Puppet 7 puppet-katello_devel#254
• Support Puppet 7 puppet-motd#4
• Support Puppet 7 puppet-pulp#412
• Support Puppet 7 puppet-pulpcore#174
• Support Puppet 7 puppet-puppet#779
• Support Puppet 7 puppet-puppetserver_foreman#5
• Support Puppet 7 puppet-qpid#147
• Support Puppet 7 puppet-tftp#111

We should also go over the dependencies and check where we need to bump dependencies.

[ehelms]

Please keep in mind I am not intending to add Puppet 7 support here. I had added Ruby 2.7 support and was informed that I should also do so via pairing it with Puppet 7. I want to test and ensure that both Kafo and the Installer's Ruby code runs under 2.7 (as it would on an RPM install) not testing Puppet's runtime ruby.

[ekohl]

If we drop 2.4, then IMHO it should also be reflected in the gemspec. Also a PR to drop Puppet 5 support would be the correct thing to do.

[ehelms]

I'll keep Puppet 5 around. This uses notValues in the excludes which to my understanding should mean, even though using excludes that what you see in the section represents the valid combination of values.

Reference on excludes -- https://www.jenkins.io/doc/book/pipeline/syntax/#matrix-excludes