Use system Puppet in CI

This uses the official Puppet AIO packages, which is also what we use in
production. This makes the tests more realistic.

.github/workflows/test.yml

@@ -26,17 +26,23 @@ jobs:
       matrix:
         include:
           - ruby: '2.7'
-            puppet: '7.0'
+            puppet: '7'
           - ruby: '3.0'
-            puppet: '7.0'
+            puppet: '7'
           - ruby: '3.2'
-            puppet: '8.0'
+            puppet: '8'
     env:
-      PUPPET_VERSION: ${{ matrix.puppet }}
+      PUPPET_VERSION: system
     steps:
       - uses: actions/checkout@v4
+      - name: Set up Puppet repositories
+        run: |
+          . /etc/os-release
+          wget "https://apt.puppet.com/puppet${{ matrix.puppet }}-release-${VERSION_CODENAME}.deb"
+          sudo apt install "puppet${{ matrix.puppet }}-release-${VERSION_CODENAME}.deb"
+          sudo apt update
       - name: Install system dependencies
-        run: sudo apt-get install -y --no-install-recommends asciidoc
+        run: sudo apt-get install -y --no-install-recommends asciidoc puppet-agent
       - name: Setup ruby
         uses: ruby/setup-ruby@v1
         with:

Gemfile

@@ -6,8 +6,11 @@ gem 'rdoc', '< 6.4'
 
 gem 'kafo', '>= 7.3', '< 8'
 gem 'librarian-puppet', '>= 3.0'
-gem 'puppet', ENV.key?('PUPPET_VERSION') ? "~> #{ENV['PUPPET_VERSION']}" : '~> 7.0'
-gem 'facter', '>= 3.0', '!= 4.0.52'
+
+group :puppet, optional: ENV.fetch('PUPPET_VERSION', nil) == 'system' do
+  gem 'puppet', ENV.key?('PUPPET_VERSION') ? "~> #{ENV['PUPPET_VERSION']}" : '~> 7.0'
+  gem 'facter', '>= 3.0', '!= 4.0.52'
+end
 
 gem 'puppet-strings'
 gem 'rake'