Add gitlab ci integration

.gitignore

@@ -1 +1,3 @@
 spec/fixtures
+public/
+.yardoc/

.gitlab-ci.yml

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+image: ruby:2.3
+
+# Test job template
+.test_template: &test_definition
+  stage: test
+  script:
+    - bundle install --jobs $(nproc) --without docs --path vendor
+    - bundle exec rake test
+
+# Test with version present on Debian stable
+test:puppet48:
+  variables:
+    PUPPET_VERSION: '~> 4.8.2'
+    FACTER_VERSION: '~> 2.4.6'
+    HIERA_VERSION: '~> 3.2.0'
+  <<: *test_definition
+
+# Test with latest Puppet release
+test:puppetlatest:
+  <<: *test_definition
+
+# Build and deploy docs on GitLab Pages
+pages:
+  stage: deploy
+  script:
+    - bundle install --without tests --path vendor
+    - bundle exec rake docs
+  artifacts:
+    paths:
+      - public

Gemfile

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+source 'https://rubygems.org'
+
+gem 'puppet', ENV['PUPPET_VERSION']
+gem 'rake'
+
+group :test do
+  gem 'facter', ENV['FACTER_VERSION']
+  gem 'hiera', ENV['HIERA_VERSION']
+  gem 'metadata-json-lint'
+  gem 'puppetlabs_spec_helper'
+  gem 'rspec-puppet-facts'
+  gem 'semantic_puppet'
+end
+
+group :docs do
+  gem 'puppet-strings'
+end