Add self-contained API simulators lab with Compose and Helm.

Ship Proxmox, oVirt, VMware, and OpenStack behind one Postgres stack,
Makefile helpers (up/clean/helm up|down/push), and a Helm chart with
namespace, Let's Encrypt ingresses, migrate inits, and skip-if-seeded jobs.

charts/api-simulators-lab/templates/namespace.yaml

@@ -0,0 +1,8 @@
+{{- if .Values.namespaceCreate }}
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: {{ include "lab.namespace" . }}
+  labels:
+    {{- include "lab.labels" . | nindent 4 }}
+{{- end }}