Use GitHub Actions for CI

.github/workflows/test.yml

@@ -0,0 +1,14 @@
+name: CI
+
+on: pull_request
+
+concurrency:
+  group: ${{ github.ref_name }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    name: Tests
+    uses: theforeman/actions/.github/workflows/smart_proxy_plugin.yml@v0
+    with:
+      plugin_repository: theforeman/smart_proxy_ansible

Gemfile

@@ -3,8 +3,7 @@ source 'https://rubygems.org'
 gemspec
 
 group :development do
-  gem 'smart_proxy', git: 'https://github.com/theforeman/smart-proxy',
-                     branch: 'develop'
+  gem 'smart_proxy', github: 'theforeman/smart-proxy', branch: ENV['SMART_PROXY_BRANCH']
   #gem 'smart_proxy', path: '../smart-proxy'
   gem 'pry'
   gem 'pry-byebug'