Add GitHub Actions.

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: Test
+on: [push, pull_request]
+jobs:
+  build:
+    name: >-
+      ${{ matrix.os }} ruby ${{ matrix.ruby }} ${{ matrix.db }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-16.04]
+        ruby:
+          - 2.7
+        db: ['']
+        include:
+          - {os: ubuntu-16.04, ruby: 2.4, db: mariadb10.0}
+      # On the fail-fast: true, it cancels all in-progress jobs
+      # if any matrix job fails unlike Travis fast_finish.
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v2
+      # https://github.com/ruby/setup-ruby
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - if: matrix.db != ''
+        run: echo 'DB=${{ matrix.db }}' >> $GITHUB_ENV
+      - run: bash .travis_setup.sh
+      - run: bundle exec rake

Gemfile

@@ -19,7 +19,7 @@ group :test do
   gem 'rubocop', '~> 0.50.0'
 end
 
-group :benchmarks do
+group :benchmarks, optional: true do
   gem 'activerecord', '>= 3.0'
   gem 'benchmark-ips'
   gem 'do_mysql'
@@ -28,7 +28,7 @@ group :benchmarks do
   gem 'sequel'
 end
 
-group :development do
+group :development, optional: true do
   gem 'pry'
   gem 'rake-compiler-dock', '~> 0.7.0'
 end