fix: remove Thread wrapper to prevent Bundler from killing background restart thread

announcement.gemspec

@@ -246,18 +246,13 @@ if bundle_update_flag
     #file.chmod(0755)
     #file.close
     restart_cmd = "UNICORN_PID=\"`fuser tmp/pids/unicorn.sock tmp/sockets/unicorn.sock tmp/unicorn.sock` `cat tmp/pids/unicorn.pid `\" && kill -s TERM $UNICORN_PID ; while (kill -0 $UNICORN_PID > /dev/null 2>&1) ; do printf '.' && sleep 1 ; done ; unset UNICORN_FD; bundle exec unicorn_rails -c config/unicorn.rb -D -E #{mode}"
-
-    a = Thread.start do
-      bundler_with_clean_env do
-          puts env_pwd
-          puts mode
-          Open3.capture3("cd #{env_pwd} && env -i HOME=\"$HOME\" bash -l -c \"#{all_command}\" ;screen -d -m -S auto_reopen_#{dir_name} bash -c \"#{use_cmd} #{restart_cmd};#{watch_dog_cmd}\" ")
-      end
+    
+    bundler_with_clean_env do
+        puts env_pwd
+        puts mode
+        pid = Process.spawn("cd #{env_pwd} && env -i HOME=\"$HOME\" bash -l -c \"#{all_command}\" ;screen -d -m -S auto_reopen_#{dir_name} bash -c \"#{use_cmd} #{restart_cmd};#{watch_dog_cmd}\" ")
+        Process.detach(pid)
     end
-    now_priority = Thread.current.priority.to_i
-    system('sleep 2')
-    a.priority =  now_priority + 2
-    a.run
     #Thread.exit
   else
     dir_name = env_pwd.split('/')[-1]