Add Github Actions build pipeline

.github/workflows/build.yml

@@ -0,0 +1,34 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: Build
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '2.7'
+        bundler-cache: true
+    - name: Setup Firefox
+      uses: browser-actions/setup-firefox@v1.1.0
+    - name: Setup Geckodriver
+      uses: browser-actions/setup-geckodriver@v0.0.0
+    - name: Start xvfb
+      run: /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+    - name: Run tests
+      run: bundle exec rake ci
+      env:
+        DISPLAY: ":99.0"