Remove retagging from ilab image

Retag is not needed as we are using static tags

Signed-off-by: Enrique Belarte Luque <ebelarte@redhat.com>

training/nvidia-bootc/Containerfile

@@ -172,7 +172,6 @@ RUN chmod +x /usr/bin/ilab
 
 ARG INSTRUCTLAB_IMAGE="quay.io/ai-lab/instructlab-nvidia:latest"
 ARG INSTRUCTLAB_IMAGE_PULL_SECRET="instructlab-nvidia-pull"
-ARG INSTRUCTLAB_IMAGE_RETAG
 
 RUN for i in /usr/bin/ilab*; do \
 	sed -i 's/__REPLACE_TRAIN_DEVICE__/cuda/' $i;  \
@@ -193,10 +192,6 @@ RUN --mount=type=secret,id=${INSTRUCTLAB_IMAGE_PULL_SECRET}/.dockerconfigjson \
          IID=$(sudo podman --root /usr/lib/containers/storage pull ${INSTRUCTLAB_IMAGE}); \
     fi
 
-RUN if [ ! -z "${INSTRUCTLAB_IMAGE_RETAG}" ]; then \
-        podman tag ${INSTRUCTLAB_IMAGE} ${INSTRUCTLAB_IMAGE%%:*}:${INSTRUCTLAB_IMAGE_RETAG}; \
-    fi
-
 RUN podman system reset --force 2>/dev/null
 
 LABEL image_version_id="${IMAGE_VERSION_ID}"