Move CI to Github Actions

.github/workflows/CI.yml

@@ -0,0 +1,37 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - '2.5'
+          - '2.6'
+          - '2.7'
+          - '3.0'
+          - '3.1'
+          - '3.2'
+          - head
+        os:
+          - "ubuntu-22.04"
+          - "ubuntu-20.04"
+          - "macos-12"
+          - "macos-11"
+    continue-on-error: ${{ matrix.ruby == 'head' }}
+    name: Ruby ${{ matrix.ruby }} / ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - run: |
+          bundle exec rake

Rakefile

@@ -54,22 +54,22 @@ end
 desc "Remove built files"
 task :clean do
   cd "ext" do
-    if File.exists?("Makefile")
+    if File.exist?("Makefile")
       sh "make clean"
       rm "Makefile"
     end
     derived_files = Dir.glob(".o") + Dir.glob("*.so") + Dir.glob("*.bundle")
     rm derived_files unless derived_files.empty?
   end
   cd "ext/attach" do
-    if File.exists?("Makefile")
+    if File.exist?("Makefile")
       sh "make clean"
       rm "Makefile"
     end
     derived_files = Dir.glob(".o") + Dir.glob("*.so") + Dir.glob("*.bundle")
     rm derived_files unless derived_files.empty?
   end
-  if File.exists?('pkg')
+  if File.exist?('pkg')
     cd 'pkg' do
       derived_files = Dir.glob('*.gem')
       rm derived_files unless derived_files.empty?