RHAIENG-2042: chore(base-images): add TARGETARCH as an argument to ubi9-python-3.12 Dockerfile

The c9s PR did not trigger building the ubi9 version, so I missed on the fact that changes are needed there.

It seems reasonable to remove the ubi9 base image as it is unused and only leave c9s. But I don't want to do it right now, first I will make it work and then make it go away.

Author: jiridanek

base-images/cpu/ubi9-python-3.12/Dockerfile.cpu

@@ -10,10 +10,12 @@ FROM registry.access.redhat.com/ubi9/python-312:latest AS base
 
 USER 0
 
+ARG TARGETARCH
 RUN \
 --mount=from=buildscripts,source=/mnt,target=/mnt \
 --mount=type=cache,sharing=locked,id=dnf-ubi9,target=/var/cache/dnf \
 /bin/bash <<'EOF'
+export TARGETARCH=$TARGETARCH
 /mnt/aipcc.sh
 EOF