Add RBS signatures from ruby/rbs repo

.github/workflows/sig.yml

@@ -0,0 +1,18 @@
+name: sig
+
+on: [push, pull_request]
+
+jobs:
+  sig:
+    runs-on: ubuntu-latest
+    env:
+      BUNDLE_WITH: sig
+    steps:
+    - uses: actions/checkout@v6
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: "4.0"
+        bundler-cache: true
+    - name: Run RBS test
+      run: bundle exec rake rbs:test

Gemfile

@@ -5,3 +5,8 @@ gemspec
 gem "rake"
 gem "test-unit"
 gem "test-unit-ruby-core"
+
+group :sig do
+  gem "rbs"
+  gem "rdoc"
+end

Rakefile

@@ -7,4 +7,12 @@ Rake::TestTask.new(:test) do |t|
   t.test_files = FileList["test/**/test_*.rb"]
 end
 
+namespace :rbs do
+  Rake::TestTask.new(:test) do |t|
+    t.libs << "test_sig"
+    t.ruby_opts << "-rtest_helper"
+    t.test_files = FileList["test_sig/test_*.rb"]
+  end
+end
+
 task :default => :test

sig/manifest.yaml

@@ -0,0 +1,3 @@
+dependencies:
+  - name: net-protocol
+  - name: uri