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/ui-deployment.yaml

@@ -0,0 +1,58 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: ui
+  namespace: artifactapi
+  annotations:
+    reloader.stakater.com/auto: "true"
+spec:
+  selector:
+    matchLabels:
+      app: ui
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: ui
+    spec:
+      automountServiceAccountToken: true
+      containers:
+        - name: ui
+          image: git.unkin.net/unkin/artifactapi-ui:v3.5.0
+          imagePullPolicy: IfNotPresent
+          ports:
+            - containerPort: 80
+              name: http
+              protocol: TCP
+          livenessProbe:
+            failureThreshold: 3
+            httpGet:
+              path: /
+              port: http
+              scheme: HTTP
+            initialDelaySeconds: 15
+            periodSeconds: 30
+            successThreshold: 1
+            timeoutSeconds: 5
+          readinessProbe:
+            failureThreshold: 3
+            httpGet:
+              path: /
+              port: http
+              scheme: HTTP
+            initialDelaySeconds: 5
+            periodSeconds: 5
+            successThreshold: 1
+            timeoutSeconds: 5
+          resources:
+            limits:
+              cpu: 500m
+              memory: 512Mi
+            requests:
+              cpu: 50m
+              memory: 128Mi
+      restartPolicy: Always