add github actions (#5)

.github/workflows/push.yml

@@ -0,0 +1,63 @@
+name: Continuous Integration
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: [2.7, "3.0", 3.1, 3.2]
+        lockfile: ['Gemfile.activerecord-6.1.lock', 'Gemfile.activerecord-7.0.lock', 'Gemfile.lock']
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          rubygems: latest
+          bundler-cache: true
+        env:
+          BUNDLE_NO_PRUNE: true
+      - name: Run tests
+        run: bin/rspec
+        env:
+          PGHOST: localhost
+          PGUSER: postgres
+          PGPASSWORD: postgres
+          BUNDLE_LOCKFILE: ${{ matrix.lockfile }}
+
+  lint:
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_LOCKFILE: "Gemfile.lock"
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+          bundler-cache: true
+      - name: Run RuboCop
+        run: bin/rubocop
+        timeout-minutes: 2