DNF Install Fails in Container: Unknown Repo Error on RHEL Systems

Issue

• During a container build on RHEL systems, the following dnf command is used to install packages from RHEL repositories"

dnf install --enablerepo=rhel-8-for-x86_64-appstream-rpms \
  --installroot=$mnt --nodocs --setopt=install_weak_deps=false \
  --setopt=reposdir=/etc/yum.repos.d <pkg>

• And it fails with the following error, even though the repository is available on the host:

Updating Subscription Management repositories.
Unable to read consumer identity
subscription-manager is operating in container mode.
Error: Unknown repo: 'rhel-8-for-x86_64-appstream-rpms'