added manifest kubernetes base and overlays for staging

overlays/staging/kustomization.yaml

@@ -0,0 +1,13 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - ../../k8s
+
+namespace: intern-workspace
+namePrefix: staging-
+commonLabels:
+  environment: staging
+
+patchesStrategicMerge:
+  - patch-deployment.yaml

overlays/staging/patch-deployment.yaml

@@ -0,0 +1,30 @@
+# ==========================
+# BACKEND PATCH
+# ==========================
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend-app-syifa
+spec:
+  replicas: 2
+  template:
+    spec:
+      containers:
+        - name: backend
+          image: docker.io/syifamaulidya/backend-app:staging   # <-- Jenkins nanti ganti otomatis ke vX
+
+---
+# ==========================
+# FRONTEND PATCH
+# ==========================
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: frontend-app-syifa
+spec:
+  replicas: 2
+  template:
+    spec:
+      containers:
+        - name: frontend
+          image: docker.io/syifamaulidya/frontend-app:staging   # <-- Jenkins juga ganti otomatis