Is it possible to ./launcher rebuild app without updating discourse?
You could, but you would have to specify the exact commit hash in your app.yml file.
Can you please give me an example how this would be setup?
In app.yml uncomment
#version: tests-passed
and replace tests-passed with the commit hash something like
version: f7a335a64e7146166d5fdaedcfee816997f2822d
You can find the commit hash in github if you click on the commit that you want.
如何找到所需的提交？
例如，我有版本 2.4.0 beta2，并希望保持在该版本。
前往 GitHub 查看标签，然后选择您需要的版本。