Install and update discourse themes
Add some logic to install themes that are pre-packaged in docker image (related to: https://lab.libreho.st/libre.sh/docker/discourse/-/issues/14)
Add some logic to update themes during app upgrade with bundle exec rake themes:update
.
For that we need to differentiate install and update job, for now it is the same job either we are installing or upgrading (same rake tasks are run)
https://meta.discourse.org/t/install-a-theme-programatically/191843