Just updated Zammad today from Ubuntu repos
3.4.x to 3.4.x (minors versions)
And my custom css went away, I tried to rerun
$ zammad run rake assets:precompile
But now it says
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
But I have it installed
$ yarn --version
$ which yarn
Now I’m not being able to apply my custom.css file.