Add kustomize production patches

mall-deployment/kubernetes/application/catalog-service/README.md

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+Output the Kustomize result
+
+```bash
+cd ./staging
+```
+
+```bash
+kubectl kustomize -o result.yml
+```

mall-deployment/kubernetes/application/catalog-service/production/application-prod.yml

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+mall:
+  greeting: Welcome to the cloud native mall from a production Kubernetes environment!
+spring:
+  config:
+    import: configtree:/workspace/secrets/*/

mall-deployment/kubernetes/application/catalog-service/production/kustomization.yml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - github.com/arch/cloud-native-mall/mall-catalog/k8s?ref=main
+
+patches:
+  - path: patch-env.yml
+  - path: patch-volumes.yml
+  - path: patch-resources.yml
+
+configMapGenerator:
+  - name: catalog-config
+    behavior: merge
+    files:
+      - application-prod.yml
+
+images:
+  - name: mall-catalog
+    newName: ghcr.io/arch/mall-catalog
+    newTag: latest
+
+replicas:
+  - name: catalog-service
+    count: 2

mall-deployment/kubernetes/application/catalog-service/production/patch-env.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: catalog-service
+spec:
+  template:
+    spec:
+      containers:
+        - name: catalog-service
+          env:
+            - name: SPRING_PROFILES_ACTIVE
+              value: prod
+            - name: BPL_JVM_THREAD_COUNT
+              value: "100"

mall-deployment/kubernetes/application/catalog-service/production/patch-resources.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: catalog-service
+spec:
+  template:
+    spec:
+      containers:
+        - name: catalog-service
+          resources:
+            requests:
+              memory: 756Mi
+              cpu: "0.1"
+            limits:
+              memory: 756Mi
+              cpu: "2"

mall-deployment/kubernetes/application/catalog-service/production/patch-volumes.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: catalog-service
+spec:
+  template:
+    spec:
+      containers:
+        - name: catalog-service
+          volumeMounts:
+            - mountPath: /workspace/secrets/postgres
+              name: postgres-credentials-volume
+            - mountPath: /workspace/secrets/keycloak
+              name: keycloak-credentials-volume
+      volumes:
+        - name: postgres-credentials-volume
+          secret:
+            secretName: mall-postgres-catalog-credentials
+        - name: keycloak-credentials-volume
+          secret:
+            secretName: mall-keycloak-issuer-resourceserver-secret