Stop Snippet fixtures from repeatedly cloning

Instead we can clone once, create a bundle on disk,
then use that repo bundle to create the rest of the
snippets

db/fixtures/development/12_snippets.rb

 require './spec/support/sidekiq_middleware'
 
 SNIPPET_REPO_URL = "https://gitlab.com/gitlab-org/gitlab-snippet-test.git"
+BUNDLE_PATH = File.join(Rails.root, 'db/fixtures/development/gitlab-snippet-test.bundle')
+
+class Gitlab::Seeder::SnippetRepository
+  def initialize(snippet)
+    @snippet = snippet
+  end
+
+  def import
+    if File.exists?(BUNDLE_PATH)
+      @snippet.repository.create_from_bundle(BUNDLE_PATH)
+    else
+      @snippet.repository.import_repository(SNIPPET_REPO_URL)
+      @snippet.repository.bundle_to_disk(BUNDLE_PATH)
+    end
+  end
+
+  def self.cleanup
+    File.delete(BUNDLE_PATH) if File.exists?(BUNDLE_PATH)
+  rescue => e
+    warn "\nError cleaning up snippet bundle: #{e}"
+  end
+end
 
 Gitlab::Seeder.quiet do
   20.times do |i|
@@ -14,7 +36,7 @@ Gitlab::Seeder.quiet do
       content: 'foo'
     }).tap do |snippet|
       unless snippet.repository_exists?
-        snippet.repository.import_repository(SNIPPET_REPO_URL)
+        Gitlab::Seeder::SnippetRepository.new(snippet).import
       end
 
       snippet.track_snippet_repository(snippet.repository.storage)
@@ -23,5 +45,7 @@ Gitlab::Seeder.quiet do
 
     print('.')
   end
+
+  Gitlab::Seeder::SnippetRepository.cleanup
 end