feat: migrate to artifactapi 3+ (#197)

What changed:
- Adds new v3 API and UI deployments (separate api-deployment.yaml, ui-deployment.yaml) alongside the existing monolithic artifactapi-deployment.yaml
- Adds CNPG PostgreSQL cluster + pooler to replace the standalone postgres deployment
- Adds new api-env configmap, new Vault secrets (postgres-credentials, environment), and a second VaultAuth (default1)
- Adds new services targeting the split api and ui selectors
- Adds HPAs for both new deployments
- Updates kustomization to include all new resources

---------

Co-authored-by: Ben Vincent <ben@unkin.net>
Reviewed-on: #197

apps/base/artifactapi/vaultauth.yaml

@@ -16,3 +16,22 @@ spec:
   method: kubernetes
   mount: k8s/au/syd1
   vaultConnectionRef: vso-system/default
+### change to default from default1
+---
+apiVersion: secrets.hashicorp.com/v1beta1
+kind: VaultAuth
+metadata:
+  name: default1
+  namespace: artifactapi
+spec:
+  allowedNamespaces:
+    - artifactapi
+  kubernetes:
+    audiences:
+      - vault
+    role: default
+    serviceAccount: default
+    tokenExpirationSeconds: 600
+  method: kubernetes
+  mount: k8s/au/syd1
+  vaultConnectionRef: vso-system/default