Move CI to GH Actions

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: CI
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  ci:
+    name: ${{ matrix.ruby-version }} ${{ matrix.friendlyName }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        ruby-version:
+          - "2.7"
+          - "3.0"
+          - "3.1"
+          - "3.2"
+          - "3.3"
+        os:
+          - ubuntu-latest
+        include:
+          - os: ubuntu-latest
+            friendlyName: Linux
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Setup Ruby and install bundle
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake