Add offline Workstation payload foundation

autoinstall/offline/container-images.txt

@@ -0,0 +1,7 @@
+# Bundle builder records the resolved digest for each image.
+ghcr.io/open-webui/open-webui:main
+vllm/vllm-openai:v0.10.2
+nvcr.io/nvidia/k8s/dcgm-exporter:3.3.0-3.2.0-ubuntu22.04
+prom/prometheus:latest
+prom/node-exporter:latest
+grafana/grafana:latest