Allow different kayobe container image base images

This change adds an argument to change the base image when building
a kayobe container image. This is required for the Zed release
of Openstack because there is no support for CentOS 8.

docker/kayobe/Dockerfile

@@ -1,6 +1,7 @@
 # syntax=docker/dockerfile:1.2
 
-FROM quay.io/centos/centos:stream8
+ARG BASE_IMAGE="quay.io/centos/centos:stream8"
+FROM ${BASE_IMAGE}
 MAINTAINER "Will Szumski" <[email protected]>
 
 # Unclear at this time if different environments will change
@@ -25,10 +26,15 @@ ENV container docker
 
 RUN dnf install epel-release -y && \
     dnf update -y --nobest && \
+    if [ "$BASE_IMAGE" == "rockylinux:9" ] ; then \
+    dnf install -y gcc git vim python3-pyyaml \
+        libffi-devel sudo which openssh-server e2fsprogs rsync \
+        diffstat diffutils debootstrap procps-ng gdisk util-linux \
+        dosfstools lvm2 kpartx systemd-udev bash-completion ; else \
     dnf install -y gcc git vim python3-pyyaml python3-virtualenv \
         libffi-devel sudo which openssh-server e2fsprogs rsync \
         diffstat diffutils debootstrap procps-ng gdisk util-linux \
-        dosfstools lvm2 kpartx systemd-udev bash-completion && \
+        dosfstools lvm2 kpartx systemd-udev bash-completion ; fi && \
     dnf clean all
 
 # Configure lvm not to use udev for device discovery. This allows you to use