Add initial GHA workflows

.github/workflows/ci.yml

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+name: CI
+on: [push]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install Ruby!
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2.2"
+
+      - name: run tests
+        run: rake test

rakelib/test.rake

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+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs << "tests"
+  t.test_files = FileList["tests/**/*_test.rb"]
+  t.verbose = true
+end
+desc 'Run tests'
+

tests/check_test.rb

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+require_relative "test_helper"
+
+class CheckTest < Minitest::Test
+  def with_captured_stdout
+    original_stdout = $stdout
+    $stdout = StringIO.new
+    yield
+    $stdout.string
+  ensure
+    $stdout = original_stdout
+  end
+
+  def test_check_asserts
+    output = with_captured_stdout do
+      Rake::Task['check:asserts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+
+  def test_check_abouts
+    output = with_captured_stdout do
+      Rake::Task['check:abouts'].invoke
+    end
+    assert_match(/OK/, output)
+  end
+end

tests/test_helper.rb

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+require "minitest/autorun"
+require "rake"
+
+Rake.application.load_rakefile