Add GitHub actions for testing (#120)

Add GitHub actions for testing

.github/workflows/ruby.yml

@@ -0,0 +1,37 @@
+# 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: Ruby
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    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: 2.6
+    - name: Install dependencies
+      run: gem install awesome_bot && gem install mdl
+    - name: Run tests
+      run: |
+        # Lint - disable some rules - https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md
+        mdl -r ~MD013,~MD029,~MD033 README.md
+        # Some URLs could be flaky, try twice in case the first execution fails.
+        bash run_awesome_bot.sh || bash run_awesome_bot.sh