rig major updates

rig/examples/data/rig.env

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+# This overlay's settings: layered over rig's defaults, under ctrl/.env and the caller.
+# data — postgres, redis and airflow (upstream images, run unmodified) in their own namespace.
+# Use it: OVERLAY=examples/data make cluster up    Notes: README.md
+
+# Order matters: addons install in the order listed, and airflow refuses to start
+# without postgres, so postgres comes first. metallb is rig's own. Airflow runs
+# LocalExecutor and needs no broker: add redis (before airflow) only to switch to Celery.
+ADDONS="metallb postgres airflow"
+
+# Namespace for the dependency containers (k8s/base/kustomization.yaml names it too).
+DATA_NAMESPACE=data
+
+# Postgres identity. The password is generated once by addons/postgres.sh and kept.
+POSTGRES_DB=app
+POSTGRES_USER=app
+POSTGRES_STORAGE=2Gi
+
+AIRFLOW_ADMIN_USER=admin
+
+# Upstream images, pinned by tag; bump freely, and preload them for an offline machine.
+POSTGRES_IMAGE=postgres:16-alpine
+REDIS_IMAGE=redis:7-alpine
+AIRFLOW_IMAGE=apache/airflow:2.10.4