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/vaultauth.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultAuth
+metadata:
+  name: default
+  namespace: artifactapi3
+spec:
+  allowedNamespaces:
+    - artifactapi3
+  kubernetes:
+    audiences:
+      - vault
+    role: default
+    serviceAccount: default
+    tokenExpirationSeconds: 600
+  method: kubernetes
+  mount: k8s/au/syd1
+  vaultConnectionRef: vso-system/default