Enable Zip64 support

The original ZIP format only supports 4 GB archives and up to 65535
files (https://www.artpol-software.com/ZipArchive/KB/0610051629.aspx).
RubyZip disables the Zip64 extensions by default, unlike the standard
`zip` command-line tool.

Archives, such as GitLab Pages deployments, may have more than 65535
files. RubyZip will truncate the central directory header to indicate
only 65535 files, but some tools may treat these headers as invalid.

Relates to https://gitlab.com/gitlab-org/gitlab-pages/-/issues/689

Changelog: fixed

config/initializers/rubyzip.rb

+# frozen_string_literal: true
+#
+# Zip64 is needed to support archives with more than 65535 entries.
+Zip.write_zip64_support = true

spec/services/pages/zip_directory_service_spec.rb

@@ -27,6 +27,10 @@ RSpec.describe Pages::ZipDirectoryService do
   let(:archive) { result[:archive_path] }
   let(:entries_count) { result[:entries_count] }
 
+  it 'returns true if ZIP64 is enabled' do
+    expect(::Zip.write_zip64_support).to be true
+  end
+
   shared_examples 'handles invalid public directory' do
     it 'returns success' do
       expect(status).to eq(:success)
@@ -35,7 +39,7 @@ RSpec.describe Pages::ZipDirectoryService do
     end
   end
 
-  context "when work direcotry doesn't exist" do
+  context "when work directory doesn't exist" do
     let(:service_directory) { "/tmp/not/existing/dir" }
 
     include_examples 'handles invalid public directory'