move CI to GitHub actions

.github/workflows/ruby.yml

@@ -0,0 +1,36 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: Iodine Build Testing
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: ['2.3', '2.6', '2.7', '3.0', '3.2']
+        os: [ubuntu-latest, macos-latest] # , windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Ruby # see https://github.com/ruby/setup-ruby#versioning)
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Build Iodine
+      run: rake install
+#    - name: Run tests
+#      run: bundle exec rake