If the host has an /etc/resolv.conf pointing to /run, that will be
invalid in the container. Let it point to the already bind-mounted file
from the host.
# install cockpit's build deps and other development tools
toolbox run -c "$NAME" sh -exc '
+if [ ! -e /etc/resolv.conf ]; then
+ sudo ln -sfn /run/host/monitor/resolv.conf /etc/resolv.conf
+fi
+
# this just refuses to rpm -i normally
sudo dnf install -y cpio
rpm2cpio ~martin/Dokumente/Arbeit/RedHat/redhat-internal-cert-install-0.1-7.el7.csb.noarch.rpm | sudo cpio -id --directory=/ --verbose "./etc/pki/*"