Use GitHub Actions for CI

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  rubies:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ ruby-head, '3.0', '2.7', '2.6', '2.5', '2.4', '2.3', '2.2' ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Install dependencies
+        run: bundle install
+      - name: Run test
+        run: rake
+      - name: Install gem
+        run: rake install
+  platforms:
+    strategy:
+      matrix:
+        os: [macos, windows]
+        ruby: ['3.0']
+    runs-on: ${{ matrix.os }}-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Install dependencies
+        run: bundle install
+      - name: Run test
+        run: rake
+      - name: Install gem
+        run: rake install

Rakefile

@@ -1,31 +1,17 @@
-task :default => :test
+require "bundler/gem_tasks"
+require "rake/testtask"
 
-# ==========================================================
-# Packaging
-# ==========================================================
-
-GEMSPEC = Gem::Specification::load('stackprof.gemspec')
-
-require 'rubygems/package_task'
-Gem::PackageTask.new(GEMSPEC) do |pkg|
+Rake::TestTask.new(:test) do |t|
+  t.libs << "test"
+  t.libs << "lib"
+  t.test_files = FileList["test/**/test_*.rb"]
 end
 
-# ==========================================================
-# Ruby Extension
-# ==========================================================
+require "rake/extensiontask"
 
-require 'rake/extensiontask'
-Rake::ExtensionTask.new('stackprof', GEMSPEC) do |ext|
-  ext.lib_dir = 'lib/stackprof'
+Rake::ExtensionTask.new("stackprof") do |ext|
+  ext.ext_dir = "ext/stackprof"
+  ext.lib_dir = "lib/stackprof"
 end
-task :build => :compile
 
-# ==========================================================
-# Testing
-# ==========================================================
-
-require 'rake/testtask'
-Rake::TestTask.new 'test' do |t|
-  t.test_files = FileList['test/test_*.rb']
-end
-task :test => :build
+task default: %i(compile test)