ci: Precreate a Docker image with the necessary dependencies to avoid waiting for DNF on each build
Currently we run
dnf install for every build that runs in CI. This is a waste of time and resources.
We could instead precreate Docker images with the necessary dependencies already installed. The https://gitlab.gnome.org/GNOME/librsvg-oci-images images shows how to do this, we would just need to clone that repo and adapt it for Tracker.