Modernize: Ruby 4.0/OpenVox support, workflow baseline sync, EL8-10, simp_rpm_helper branch fix (2.3.0)

[silug]

Summary

Brings simp-adapter up to the current SIMP tooling baseline and fixes a real bug that broke simp_rpm_helper on modern git.

Test tooling (Gemfile/Rakefile)

• Replace the puppet gem with openvox (>= 8, < 9, overridable via PUPPET_VERSION/OPENVOX_VERSION)
• Move to simp-rake-helpers ~> 6.0, which replaces puppetlabs_spec_helper with voxpupuli-test, and simp-beaker-helpers ~> 3.1
• Drop unused puppetlabs_spec_helper, hiera-puppet-helper, rspec-puppet, and the Ruby < 2.6 pathspec pin
• Drop the explicit rubocop/rubocop-rake/rubocop-rspec pins (now pinned via voxpupuli-test); keep rubocop-performance
• Add ostruct (bundled gem as of Ruby 3.5; required by simp_rpm_helper)
• Drop require 'simp/rake/ci' (removed with GitLab CI support in simp-rake-helpers 6)
• Add the standard Gemfile.project/Gemfile.local/EXTRA_GEMFILE hooks

simp_rpm_helper fix (2.3.0)

git init --bare and clones of empty repos take the branch name from init.defaultBranch, which is main on modern git, so the initial git push origin master failed. (This is what the previously-failing unit test caught.) Now:

• Repos created by simp_rpm_helper are pinned to master regardless of the host's git configuration, so the branch name stays deterministic across a fleet and matches the documented behavior
• Updates detect the default branch from the existing central repo's HEAD (falling back to master), so a pre-existing repo with a different default branch (e.g. main) is honored
• Regression tests cover both behaviors

RPM spec (2.3.0)

• Accept openvox-agent as an alternative to puppet-agent via RPM boolean dependencies (supported on EL8+), including Requires(postun)
• Drop the EL7 conditional dependency block

GitHub Actions

• pr_tests.yml: spec matrix is now the openvox 8 gem on Ruby 3.2/3.4 plus an OpenVox 9 preview on Ruby 4.0; rubocop and RELENG checks run on Ruby 4.0.6
• Replace tag_deploy_asset.yml + tag_deploy_github-rpms-el7-el8.yml with the standardized tag_deploy_github-rpms.yml (single dispatch; build-OS matrix lives in release_rpms.yml, per tag_deploy workflows hardcode centos7/centos8 RPM builds; move the OS matrix into release_rpms.yml (el8/el9/el10) puppetsync#84)
• release_rpms.yml: build el8/el9/el10 RPMs using the ghcr.io/simp/simp-<os>-build containers

Acceptance nodesets

• Replace the EL7-era CentOS/Oracle nodesets with AlmaLinux 8/9/10 and Oracle Linux 8/9 defaulting to the openvox8 collection (default nodeset: AlmaLinux 9)

Testing

On Ruby 4.0.5 with the new Gemfile:

• bundle exec rake spec — 23 examples, 0 failures (was 1 failure from the git default-branch bug)
• bundle exec rubocop — no offenses
• bundle exec rake pkg:check_version pkg:compare_latest_tag pkg:create_tag_changelog pkg:check_rpm_changelog — pass
• bundle exec rake pkg:rpm — builds simp-adapter-2.3.0-1.el8.noarch.rpm; rpm -qp --requires --recommends shows the boolean agent deps as expected

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