files: add yaml for question 3

workspace/q03/overlays/prod/kustomization.yaml

@@ -0,0 +1,13 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - ../../base
+  - namespace.yaml
+namespace: store-prod
+labels:
+  - pairs:
+      env: prod
+    includeSelectors: false
+replicas:
+  - name: store-api
+    count: 3

workspace/q03/overlays/prod/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: store-prod