feat(image-builder): pre-bake Loki and Promtail images for airgap support

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: OmkarDeshpande7

image_builder/scripts/download_images.sh

@@ -22,6 +22,8 @@ prometheus_config_reloader="quay.io/prometheus-operator/prometheus-config-reload
 prometheus_operator="quay.io/prometheus-operator/prometheus-operator:v0.89.0"
 configmap_reload="ghcr.io/jimmidyson/configmap-reload:v0.15.0"
 grafana="docker.io/grafana/grafana:12.3.3"
+loki="docker.io/grafana/loki:3.5.0"
+promtail="docker.io/grafana/promtail:3.5.0"
 v2v_helper="quay.io/platform9/vjailbreak-v2v-helper:$TAG"
 controller="quay.io/platform9/vjailbreak-controller:$TAG"
 ui="quay.io/platform9/vjailbreak-ui:$TAG"
@@ -65,6 +67,8 @@ images=(
   "$ui"
   "$configmap_reload"
   "$grafana"
+  "$loki"
+  "$promtail"
   "$alpine"
   "$vpwned"
   "$ai"