Do not retry "git gc"

app/services/projects/housekeeping_service.rb

@@ -24,7 +24,7 @@ module Projects
     def execute
       raise LeaseTaken if !try_obtain_lease
 
-      GitlabShellWorker.perform_async(:gc, @project.path_with_namespace)
+      GitlabShellOneShotWorker.perform_async(:gc, @project.path_with_namespace)
     ensure
       @project.update_column(:pushes_since_gc, 0)
     end

app/workers/gitlab_shell_one_shot_worker.rb

@@ -0,0 +1,10 @@
+class GitlabShellOneShotWorker
+  include Sidekiq::Worker
+  include Gitlab::ShellAdapter
+
+  sidekiq_options queue: :gitlab_shell, retry: false
+
+  def perform(action, *arg)
+    gitlab_shell.send(action, *arg)
+  end
+end