Merge pull request #6 from cs169/#187042228-set-up-ci

Chore: Set Up CI

.github/workflows/main.yml

@@ -0,0 +1,18 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 3.3.0
+    - name: Build and test with RSpec
+      run: |
+        gem install bundler
+        bundle install --jobs 4 --retry 3
+        bundle exec rspec