install linux packages on mendix/rootfs:ubi8 Docker image

0 is based on where the Redhat repositories are not listed in /etc/yum.repos.d/   How to install, for instance, the LibRaw package which is normally in the "appstream" repo, not in any ubi-8-* repos?   Or are there extra ubi-8-* repost that I need to install/enable?
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