ci: install wget for downloading Helm

Installing Helm fails if `wget` is not available. The script that
installs Helm does not seem to abort though.

By installing `wget` in preparation for deploying with Helm, the CI jobs
should get ready to run successfully.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

prepare.sh

@@ -78,7 +78,7 @@ done
 
 set -x
 
-dnf -y install git podman make
+dnf -y install git podman make wget
 
 # minikube wants the user (everything runs as root) to be in the libvirt group
 getent group libvirt || groupadd --system libvirt