Add a basic github action with the build

.github/workflows/ruby.yml

@@ -0,0 +1,30 @@
+name: Ruby
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Set up Ruby and install dependencies
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.0
+
+      - name: Install dependencies
+        run: |
+          gem install bundler
+          bundle install
+
+      - name: Run RSpec tests
+        run: bundle exec rake spec