Add dependencies locally

deps/protobuf/ruby/google-protobuf.gemspec

@@ -0,0 +1,27 @@
+Gem::Specification.new do |s|
+  s.name        = "google-protobuf"
+  s.version     = "3.20.3"
+  git_tag       = "v#{s.version.to_s.sub('.rc.', '-rc')}" # Converts X.Y.Z.rc.N to vX.Y.Z-rcN, used for the git tag
+  s.licenses    = ["BSD-3-Clause"]
+  s.summary     = "Protocol Buffers"
+  s.description = "Protocol Buffers are Google's data interchange format."
+  s.homepage    = "https://developers.google.com/protocol-buffers"
+  s.authors     = ["Protobuf Authors"]
+  s.email       = "protobuf@googlegroups.com"
+  s.metadata    = { "source_code_uri" => "https://github.com/protocolbuffers/protobuf/tree/#{git_tag}/ruby" }
+  s.require_paths = ["lib"]
+  s.files       = Dir.glob('lib/**/*.rb')
+  if RUBY_PLATFORM == "java"
+    s.platform  = "java"
+    s.files     += ["lib/google/protobuf_java.jar"]
+  else
+    s.files     += Dir.glob('ext/**/*')
+    s.extensions= ["ext/google/protobuf_c/extconf.rb"]
+    s.add_development_dependency "rake-compiler-dock", "= 1.2.1"  end
+  s.test_files  = ["tests/basic.rb",
+                  "tests/stress.rb",
+                  "tests/generated_code_test.rb"]
+  s.required_ruby_version = '>= 2.3'
+  s.add_development_dependency "rake-compiler", "~> 1.1.0"
+  s.add_development_dependency "test-unit", '~> 3.0', '>= 3.0.9'
+end