[opensuse-buildservice] How to specify a self reference in a Dockerfile?

What is the required syntax to use binary packages from the same prj in a Dockerfile? Last time I created an image I used something like this (with expanded variables) to make the packages known at build time: RUN zypper ar -cf "http://download.opensuse.org/repositories/${prj}/${repository}" "reponame" This can not work if one branches a pkg from another prj because the binaries from the own prj are not published. And even if they are published, the URL must be adjusted prior submit request. Olaf