[rubygems/rubygems] Don't include hook templates in cached git source

With a default git setup, each cloned repo in the cache will end up with
~60K of sample git hooks. These files all end in `.sample`, and they are
disabled by default. Deleting them should be a no-op, and makes the
cache a bit smaller.

https://github.com/rubygems/rubygems/commit/d2149999cd

lib/bundler/source/git.rb

@@ -226,6 +226,7 @@ module Bundler
         git_proxy.checkout if requires_checkout?
         FileUtils.cp_r("#{cache_path}/.", app_cache_path)
         FileUtils.touch(app_cache_path.join(".bundlecache"))
+        FileUtils.rm_rf(Dir.glob(app_cache_path.join("hooks/*.sample")))
       end
 
       def load_spec_files

spec/bundler/cache/git_spec.rb

@@ -27,6 +27,7 @@ RSpec.describe "bundle cache with git" do
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}")).to exist
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}/.git")).not_to exist
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}/.bundlecache")).to be_file
+    expect(Dir.glob(bundled_app("vendor/cache/foo-1.0-#{ref}/hooks/*.sample"))).to be_empty
 
     FileUtils.rm_rf lib_path("foo-1.0")
     expect(the_bundle).to include_gems "foo 1.0"