Setup CI on Actions

Author: ahayworth

.github/workflows/main.yml

@@ -0,0 +1,16 @@
+name: CI
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: [2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6]
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v1
+    - name: Test
+      run: |
+        ruby -v
+    container:
+      image: ruby:${{matrix.ruby-version}}