Setup ruby_memcheck

Hoping it might find the leak reported in ruby#460

.github/workflows/ci.yml

@@ -6,41 +6,20 @@ on:
 - workflow_dispatch
 
 jobs:
-  ruby-versions:
-    uses: ruby/actions/.github/workflows/ruby_versions.yml@master
-    with:
-      engine: cruby-jruby
-      min_version: 2.7
-
   host:
     needs: ruby-versions
-    name: ${{ matrix.os }} ${{ matrix.ruby }}
-    runs-on: ${{ matrix.os }}
+    name: Ruby memcheck
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
-      matrix:
-        os:
-        - ubuntu-22.04
-        - macos-13
-        - macos-14
-        - windows-latest
-        ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
-        include:
-        - { os: windows-latest , ruby: mswin     } # ruby/ruby windows CI
-        - { os: ubuntu-latest  , ruby: jruby-9.4 } # Ruby 3.1
-        - { os: macos-latest   , ruby: truffleruby-head }
-        - { os: ubuntu-latest  , ruby: truffleruby-head }
-        exclude:
-        - { os: windows-latest, ruby: jruby }
-        - { os: windows-latest, ruby: jruby-head }
 
     steps:
       - uses: actions/checkout@v3
 
       - name: Set up Ruby
         uses: ruby/setup-ruby-pkgs@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: "3.3"
           apt-get: ragel
           brew: ragel
 
@@ -50,9 +29,4 @@ jobs:
 
       - run: rake compile
 
-      - run: rake test
-
-      - run: rake build
-
-      - run: gem install pkg/*.gem
-        if: ${{ matrix.ruby != '3.2' }}
+      - run: rake valgrind

.github/workflows/memcheck.yml

@@ -0,0 +1,58 @@
+name: CI
+
+on:
+- push
+- pull_request
+- workflow_dispatch
+
+jobs:
+  ruby-versions:
+    uses: ruby/actions/.github/workflows/ruby_versions.yml@master
+    with:
+      engine: cruby-jruby
+      min_version: 2.7
+
+  host:
+    needs: ruby-versions
+    name: ${{ matrix.os }} ${{ matrix.ruby }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-22.04
+        - macos-13
+        - macos-14
+        - windows-latest
+        ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
+        include:
+        - { os: windows-latest , ruby: mswin     } # ruby/ruby windows CI
+        - { os: ubuntu-latest  , ruby: jruby-9.4 } # Ruby 3.1
+        - { os: macos-latest   , ruby: truffleruby-head }
+        - { os: ubuntu-latest  , ruby: truffleruby-head }
+        exclude:
+        - { os: windows-latest, ruby: jruby }
+        - { os: windows-latest, ruby: jruby-head }
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby-pkgs@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          apt-get: ragel
+          brew: ragel
+
+      - run: |
+          bundle config --without benchmark
+          bundle install
+
+      - run: rake compile
+
+      - run: rake test
+
+      - run: rake build
+
+      - run: gem install pkg/*.gem
+        if: ${{ matrix.ruby != '3.2' }}

Gemfile

@@ -7,6 +7,7 @@ else
 end
 
 group :development do
+  gem "ruby_memcheck"
   gem "ostruct"
   gem "rake"
   gem "rake-compiler"

Rakefile

@@ -1,3 +1,5 @@
+require "ruby_memcheck"
+
 begin
   require 'rubygems/package_task'
 rescue LoadError
@@ -250,6 +252,12 @@ else
     t.options = '-v'
   end
 
+  RubyMemcheck::TestTask.new(valgrind: [ :set_env_ext, :check_env, :compile, :do_test_ext ]) do |t|
+    t.test_files = FileList['test/json/*_test.rb']
+    t.verbose = true
+    t.options = '-v'
+  end
+
   desc "Update the tags file"
   task :tags do
     system 'ctags', *Dir['**/*.{rb,c,h,java}']