feat: migrate to artifactapi 3+

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

apps/base/artifactapi/api-deployment.yaml

@@ -0,0 +1,91 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: api
+  namespace: artifactapi
+  annotations:
+    reloader.stakater.com/auto: "true"
+spec:
+  selector:
+    matchLabels:
+      app: api
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate
+  template:
+    metadata:
+      labels:
+        app: api
+    spec:
+      automountServiceAccountToken: true
+      initContainers:
+        - name: combine-certs
+          image: alpine:3
+          command:
+            - sh
+            - -c
+            - cat /etc/ssl/certs/ca-certificates.crt /custom-ca/ca.crt > /combined-certs/ca-certificates.crt
+          volumeMounts:
+            - name: vault-ca-cert
+              mountPath: /custom-ca
+              readOnly: true
+            - name: combined-certs
+              mountPath: /combined-certs
+      containers:
+        - name: api
+          image: git.unkin.net/unkin/artifactapi:v3.5.0
+          imagePullPolicy: IfNotPresent
+          ports:
+            - containerPort: 8000
+              name: http
+              protocol: TCP
+          envFrom:
+            - configMapRef:
+                name: api-env
+                optional: false
+            - secretRef:
+                name: environment2
+                optional: false
+          volumeMounts:
+            - name: combined-certs
+              mountPath: /etc/ssl/combined
+              readOnly: true
+          livenessProbe:
+            failureThreshold: 3
+            httpGet:
+              path: /health
+              port: http
+              scheme: HTTP
+            initialDelaySeconds: 30
+            periodSeconds: 30
+            successThreshold: 1
+            timeoutSeconds: 5
+          readinessProbe:
+            failureThreshold: 3
+            httpGet:
+              path: /health
+              port: http
+              scheme: HTTP
+            initialDelaySeconds: 10
+            periodSeconds: 5
+            successThreshold: 1
+            timeoutSeconds: 5
+          resources:
+            limits:
+              cpu: "1"
+              memory: 4Gi
+            requests:
+              cpu: 100m
+              memory: 256Mi
+      volumes:
+        - name: vault-ca-cert
+          secret:
+            secretName: vault-ca-cert
+            items:
+              - key: ca.crt
+                path: ca.crt
+        - name: combined-certs
+          emptyDir: {}
+      restartPolicy: Always