我尝试按照以下说明重建应用程序：更改 Discourse 实例的跟踪分支，但在更新 app.yml 并重建容器时：
git pull
./launcher rebuild app
我遇到了致命错误，显示：
FAILED
--------------------
Pups::ExecError: cd /var/www/discourse & git fetch --depth 1 origin tests-passed failed with return #<Process::Status: pid 140 exit 128>
Location of failure: /usr/local/lib/ruby/gems/2.7.0/gems/pups-1.1.1/lib/pups/exec_command.rb:117:in `spawn'
exec failed with the params {"cd"=>"$home", "hook"=>"code", "cmd"=>["git reset --hard", "git clean -f", "git remote set-branches --add origin main", "git remote set-branches origin $version", "git fetch --depth 1 origin $version", "git checkout $version", "mkdir -p tmp", "chown discourse:www-data tmp", "mkdir -p tmp/pids", "mkdir -p tmp/sockets", "touch tmp/.gitkeep", "mkdir -p /shared/log/rails", "bash -c \"touch -a /shared/log/rails/{production,production_errors,unicorn.stdout,unicorn.stderr,sidekiq}.log\"", "bash -c \"ln -s /shared/log/rails/{production,production_errors,unicorn.stdout,unicorn.stderr,sidekiq}.log $home/log\"", "bash -c \"mkdir -p /shared/{uploads,backups}\"", "bash -c \"ln -s /shared/{uploads,backups} $home/public\"", "bash -c \"mkdir -p /shared/tmp/{backups,restores}\"", "bash -c \"ln -s /shared/tmp/{backups,restores} $home/tmp\"", "chown -R discourse:www-data /shared/log/rails /shared/uploads /shared/backups /shared/tmp\"", "find public/plugins/ -maxdepth 1 -xtype l -delete"]}}
bootstrap failed with exit code 128
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
14b470c4c6575f2bc366dff1fa8559f98bce37abe5703f63c070b939f67dab65
并且网站显示：
502 Bad Gateway
我该如何解决？
完整的日志在这里：
whole log.txt (18.3 KB)
看起来重建失败了，我运行了 ./discourse-doctor，显示：
==================== SERIOUS PROBLEM!!!! ====================
app not running!
Attempting to rebuild