Run valgrind on CI to check memory leaks

Many gems with C-extensions have been using valgrind to check memory leaks,
such as `prism`, `lrama`, and `json`.

The simplest way to run valgrind on CI is through `ruby_memcheck` gem,
which is used by both `prism` and `json`. So I followed its readme
to add a new job `valgrind` to `ruby.yml`.

Author: st0012

.github/workflows/ruby.yml

@@ -80,3 +80,29 @@ jobs:
       - name: Run test
         run: |
           bundle exec rake ${{ matrix.job }}
+  valgrind:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.4"
+          bundler-cache: none
+      - name: Set working directory as safe
+        run: git config --global --add safe.directory $(pwd)
+      - name: Set up permission
+        run: chmod -R o-w /opt/hostedtoolcache/Ruby
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libdb-dev curl autoconf automake m4 libtool python3 valgrind
+      - name: Update rubygems & bundler
+        run: |
+          ruby -v
+          gem update --system
+      - name: bin/setup
+        run: |
+          bin/setup
+      - run: bundle exec rake test:valgrind
+        env:
+          RUBY_FREE_AT_EXIT: 1

Gemfile

@@ -37,6 +37,7 @@ group :profilers do
   gem 'stackprof'
   gem 'memory_profiler'
   gem 'benchmark-ips'
+  gem "ruby_memcheck", platform: :ruby
 end
 
 # Test gems

Gemfile.lock

@@ -60,13 +60,17 @@ GEM
     logger (1.6.6)
     marcel (1.0.4)
     memory_profiler (1.1.0)
+    mini_portile2 (2.8.8)
     minitest (5.25.4)
     mutex_m (0.3.0)
     net-protocol (0.2.2)
       timeout
     net-smtp (0.5.1)
       net-protocol
     nkf (0.2.0)
+    nokogiri (1.18.3)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     ostruct (0.6.1)
     parallel (1.26.3)
     parser (3.3.7.1)
@@ -126,6 +130,8 @@ GEM
       lint_roller (~> 1.1)
       rubocop (~> 1.72.1)
     ruby-progressbar (1.13.0)
+    ruby_memcheck (3.0.1)
+      nokogiri
     securerandom (0.4.1)
     stackprof (0.2.27)
     steep (1.9.4)
@@ -193,6 +199,7 @@ DEPENDENCIES
   rubocop
   rubocop-on-rbs
   rubocop-rubycw
+  ruby_memcheck
   stackprof
   steep
   tempfile

Rakefile

@@ -3,6 +3,10 @@ require "rake/testtask"
 require "rbconfig"
 require 'rake/extensiontask'
 
+on_windows = /mswin|mingw/ =~ RUBY_PLATFORM
+
+require "ruby_memcheck" if !on_windows
+
 $LOAD_PATH << File.join(__dir__, "test")
 
 ruby = ENV["RUBY"] || RbConfig.ruby
@@ -11,14 +15,22 @@ bin = File.join(__dir__, "bin")
 
 Rake::ExtensionTask.new("rbs_extension")
 
-Rake::TestTask.new(:test => :compile) do |t|
+test_config = lambda do |t|
   t.libs << "test"
   t.libs << "lib"
   t.test_files = FileList["test/**/*_test.rb"].reject do |path|
     path =~ %r{test/stdlib/}
   end
 end
 
+Rake::TestTask.new(test: :compile, &test_config)
+
+unless on_windows
+  namespace :test do
+    RubyMemcheck::TestTask.new(valgrind: :compile, &test_config)
+  end
+end
+
 multitask :default => [:test, :stdlib_test, :typecheck_test, :rubocop, :validate, :test_doc]
 
 task :lexer do