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/services.yaml

@@ -49,3 +49,55 @@ spec:
     app: redis
   sessionAffinity: None
   type: ClusterIP
+####
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: artifactapi
+  namespace: artifactapi
+spec:
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: http
+      port: 80
+      protocol: TCP
+      targetPort: http
+  selector:
+    app: api
+  sessionAffinity: None
+  type: ClusterIP
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: ui
+  namespace: artifactapi
+spec:
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: http
+      port: 80
+      protocol: TCP
+      targetPort: http
+  selector:
+    app: ui
+  sessionAffinity: None
+  type: ClusterIP
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: redis
+  namespace: artifactapi
+spec:
+  internalTrafficPolicy: Cluster
+  ports:
+    - name: redis
+      port: 6379
+      protocol: TCP
+      targetPort: redis
+  selector:
+    app: redis
+  sessionAffinity: None
+  type: ClusterIP