Add GitHub Actions workflow for building the project

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: Build
+
+on:
+  push:
+    paths-ignore:
+      - '*.md'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: ./
+
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: '3.3'
+        bundler-cache: true
+
+    - run: |
+        bin/rails db:prepare
+        bin/rails test test/unit/news_test.rb
+        bin/rails test test/system/my_page_test.rb

action.yml

@@ -15,6 +15,10 @@ inputs:
     required: true
     default: 'sqlite3'
 
+env:
+  CAPYBARA_SERVER_HOST: chrome
+  CAPYBARA_SERVER_PORT: 4444
+
 runs:
   using: composite