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.

docker/postgres-init/01-simulators.sql

@@ -0,0 +1,11 @@
+CREATE USER proxmox WITH PASSWORD 'proxmox';
+CREATE DATABASE proxmox_simulator OWNER proxmox;
+
+CREATE USER ovirt WITH PASSWORD 'ovirt';
+CREATE DATABASE ovirt_simulator OWNER ovirt;
+
+CREATE USER vmware WITH PASSWORD 'vmware';
+CREATE DATABASE vmware_simulator OWNER vmware;
+
+CREATE USER openstack WITH PASSWORD 'openstack';
+CREATE DATABASE openstack_simulator OWNER openstack;