Add a multi-platform Gemfile.lock (#19804)

Prerequisite for adopting https://github.com/bazel-contrib/rules_ruby

#test-continuous

Closes #19804

COPYBARA_INTEGRATE_REVIEW=https://github.com/protocolbuffers/protobuf/pull/19804 from protocolbuffers:gemfile_lock 2bf39f5713
PiperOrigin-RevId: 714311028

.gitignore

@@ -184,7 +184,6 @@ ruby/tests/utf8_pb.rb
 ruby/compatibility_tests/v3.0.0/protoc
 ruby/compatibility_tests/v3.0.0/tests/generated_code_pb.rb
 ruby/compatibility_tests/v3.0.0/tests/test_import_pb.rb
-ruby/Gemfile.lock
 
 # IntelliJ CLion Config files and build output
 cmake/.idea

ruby/Gemfile.lock

@@ -0,0 +1,47 @@
+PATH
+  remote: .
+  specs:
+    google-protobuf (4.30.0-java)
+      ffi (~> 1)
+      ffi-compiler (~> 1)
+      rake (>= 13)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    bigdecimal (3.1.8)
+    bigdecimal (3.1.8-java)
+    ffi (1.17.0)
+    ffi-compiler (1.3.2)
+      ffi (>= 1.15.5)
+      rake
+    power_assert (2.0.5)
+    rake (13.2.1)
+    rake-compiler (1.1.9)
+      rake
+    test-unit (3.6.7)
+      power_assert
+
+PLATFORMS
+  aarch64-linux
+  arm-linux
+  arm64-darwin
+  arm64-linux
+  java
+  x64-mingw-ucrt
+  x64-mingw32
+  x86-linux
+  x86-mingw32
+  x86_64-darwin
+  x86_64-linux
+
+DEPENDENCIES
+  bigdecimal
+  ffi (~> 1)
+  ffi-compiler (~> 1)
+  google-protobuf!
+  rake-compiler (~> 1.1.0)
+  test-unit (~> 3.0, >= 3.0.9)
+
+BUNDLED WITH
+   2.4.10