install python3-dnf for ansible

Author: bedroge

.github/workflows/Dockerfile-rockylinux-8

@@ -6,6 +6,7 @@ RUN dnf install -y epel-release
 RUN dnf install -y cronie
 RUN dnf install -y git
 RUN dnf install -y curl
+RUN dnf install -y python3-dnf
 
 # We now use uv to install and run ansible (see test_playbooks.sh)
 #RUN dnf install -y python3-pip