feat(nvidia-bootc): Introduce INSTRUCTLAB_IMAGE_PULL_SECRET as build-…

…arg for Konflux build

Signed-off-by: Matthieu Bernardin <mbernard@redhat.com>

training/nvidia-bootc/Containerfile

@@ -196,6 +196,7 @@ RUN grep -q /usr/lib/containers/storage /etc/containers/storage.conf || \
     && chmod +x /usr/bin/ilab
 
 ARG INSTRUCTLAB_IMAGE="quay.io/ai-lab/instructlab-nvidia:latest"
+ARG INSTRUCTLAB_IMAGE_PULL_SECRET="instructlab-nvidia-pull"
 
 RUN for i in /usr/bin/ilab*; do \
 	sed -i 's/__REPLACE_TRAIN_DEVICE__/cuda/' $i;  \
@@ -206,11 +207,12 @@ RUN for i in /usr/bin/ilab*; do \
 # Added for running as an OCI Container to prevent Overlay on Overlay issues.
 VOLUME /var/lib/containers
 
+
 RUN --mount=type=secret,id=instructlab-nvidia-pull/.dockerconfigjson \
     if [ -f "/run/.input/instructlab-nvidia/oci-layout" ]; then \
          IID=$(podman --root /usr/lib/containers/storage pull oci:/run/.input/instructlab-nvidia) && \
          podman --root /usr/lib/containers/storage image tag ${IID} ${INSTRUCTLAB_IMAGE}; \
-    elif [ -f "/run/secrets/instructlab-nvidia-pull/.dockerconfigjson" ]; then \
+    elif [ -f "/run/secrets/${INSTRUCTLAB_IMAGE_PULL_SECRET}/.dockerconfigjson" ]; then \
          IID=$(sudo podman --root /usr/lib/containers/storage pull --authfile /run/secrets/instructlab-nvidia-pull/.dockerconfigjson ${INSTRUCTLAB_IMAGE}); \
     else \
          IID=$(sudo podman --root /usr/lib/containers/storage pull ${INSTRUCTLAB_IMAGE}); \