There is something that I don't understand how to do, with clickable.

I my docker container I would need to run something like this:

dpkg --add-architecture arm64
apt-get update -y
apt-get install -y --no-install-recommends libgtk-3-dev:arm64 libgtk2.0-dev:arm64 libmaliit-glib-dev:arm64 libmaliit-glib2:arm64

To install dependencies needed to cross-compile a package for target arch (arm64).

But I can't find a way to install a package from another architecture than the host architecture, and I don't seem to find a way to run a configuration command as root inside the docker container from the clickable.yaml file?

How should this be done, knowing that it you are going to cross-compile a package for arm64, being able to install dependencies for the target architecture is kind of a staple.