Add GitHub actions

.github/workflows/ci-workflow.yml

@@ -0,0 +1,37 @@
+name: "CI Tests"
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: "[${{matrix.ruby}}/${{matrix.os}}] CI Tests [Ruby/OS]"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-20.04, macos-10.15, windows-2019]
+        # 3.0 is interpreted as 3
+        ruby: [2.2, 2.3, 2.4, 2.5, 2.6, 2.7, "3.0", 3.1, 3.2, 3.3]
+        exclude:
+          - { os: windows-2019, ruby: 2.2 }
+          - { os: windows-2019, ruby: 2.3 }
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install Ruby & 'bundle install'
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Run Test
+        run: |
+          ruby -v
+          bundle exec rake
+        env:
+          CI: true