Migrate CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,53 @@
+# 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: CI
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version:
+          - '2.6'
+          - '2.7'
+          - '3.0'
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+      # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
+      # change this to (see https://github.com/ruby/setup-ruby#versioning):
+      # uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+      - name: Run tests
+        run: bundle exec rake spec
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          flag-name: run-${{ matrix.ruby-version }}
+          parallel: true
+
+  finish:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+      - name: Coveralls Finished
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.github_token }}
+          parallel-finished: true