test: upgrade to rack 3.x and add workaround to rack 3.1.x

related: pact-foundation/pact-mock_service#152

.github/workflows/test.yml

@@ -10,6 +10,7 @@ jobs:
       matrix:
         ruby_version: ["2.7", "3.0", "3.1", "3.2", "3.3"]
         os: ["ubuntu-latest","windows-latest","macos-latest"]
+        rack_version: ["2", "3"]
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1

Gemfile

@@ -5,7 +5,7 @@ ruby ">= 2.6"
 gemspec
 
 if ENV['X_PACT_DEVELOPMENT']
-  gem "pact", path: '../pact'
+  gem "pact", path: '../pact-ruby'
   gem "pact-message", path: '../pact-message-ruby'
   gem "pact-support", path: '../pact-support'
 end

pact-provider-verifier.gemspec

@@ -26,7 +26,12 @@ Gem::Specification.new do |gem|
   gem.add_runtime_dependency 'faraday', '~> 2.5'
   gem.add_runtime_dependency 'faraday-retry', '~> 2.2'
   gem.add_runtime_dependency 'json',  '>1.8'
-  gem.add_runtime_dependency 'rack', '~> 2.1'
+  if ENV['RACK_VERSION'] == '2'
+    gem.add_runtime_dependency 'rack', '>= 2.0', '< 3.0'
+  else
+    gem.add_runtime_dependency 'rack', '>= 2.0'
+    gem.add_runtime_dependency 'rackup', '~> 2.0'
+  end  
   gem.add_runtime_dependency 'rack-reverse-proxy'
   gem.add_runtime_dependency 'rspec_junit_formatter', '~> 0.3'