feat: add artifactapi3 application

Deploy artifactapi v3 with separate API and UI deployments, CNPG
PostgreSQL cluster with pooler, and Redis. Routes traffic via
Gateway API for artifactapi.main.unkin.net and
artifactapi3.k8s.syd1.au.unkin.net.

apps/base/artifactapi3/kustomization.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - api-deployment.yaml
+  - api-hpa.yaml
+  - cnpg_cluster.yaml
+  - cnpg_pooler.yaml
+  - configmap.yaml
+  - gateway.yaml
+  - httproute.yaml
+  - namespace.yaml
+  - redis-deployment.yaml
+  - services.yaml
+  - ui-deployment.yaml
+  - ui-hpa.yaml
+  - vaultauth.yaml
+  - vaultstaticsecret.yaml