Configure GitHub Actions (based on #733)

.github/workflows/test.yml

@@ -0,0 +1,49 @@
+name: Parser Tests
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_JOBS: 4
+      BUNDLE_RETRY: 3
+      CI: true
+      TRUFFLERUBYOPT: "--engine.Mode=latency"
+    continue-on-error: ${{ matrix.experimental }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ["2.4.10", "2.5.8", "2.6.6", "2.7.1", "jruby-9.2", "truffleruby"]
+        test_command: ["bundle exec rake test", "./ci/run_rubocop_specs"]
+        experimental: [false]
+        include:
+          - ruby: "head"
+            experimental: true
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/cache@v1
+      with:
+        path: /home/runner/bundle
+        key: bundle-${{ matrix.ruby }}-${{ hashFiles('../Gemfile') }}-${{ hashFiles('**/*.gemspec') }}
+        restore-keys: |
+          bundle-${{ matrix.ruby }}-
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - name: Install Ragel
+      run: |
+        sudo apt-get update
+        sudo apt-get install ragel
+    - name: Bundle install
+      run: |
+        bundle config path /home/runner/bundle
+        bundle install
+        bundle update
+    - name: Run tests
+      run: |
+        bundle exec rake test