feat(db): add postgres service

kustomize/base/postgres/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  annotations:
+    argocd.argoproj.io/sync-wave: "0"
+spec:
+  clusterIP: None
+  ports:
+    - name: pg
+      port: 5432
+      targetPort: pg
+  selector:
+    app: postgres