ci: add gha ci workflow

.github/workflows/test.yml

@@ -0,0 +1,22 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby_version: ["2.7", "3.0", "3.1", "3.2", "3.3"]
+        os: ["ubuntu-latest","windows-latest","macos-latest"]
+        # rack_version: ["2", "3"]
+    runs-on: ${{ matrix.os }}
+    # env:
+    #   RACK_VERSION: ${{ matrix.rack_version }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby_version }}
+      - run: "bundle install"
+      - run: "bundle exec rake"