Add main backend service and configurations

internal/tools/config/base/kustomization.yaml

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+configmapGenerator:
+- name: elasticsearch-config
+  literals:
+  - es-url="http://esbasic-master:9200"
+  - kustomize-index-name="kustomize"
+  - plugin-index-name="plugin"

internal/tools/config/webapp/backend/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: kustomize-search
+spec:
+  selector:
+    matchLabels:
+      app: kustomize-search
+      tier: backend
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: kustomize-search
+        tier: backend
+    spec:
+      containers:
+      - name: kustomize-search
+        image: gcr.io/kustomize-search/backend:latest
+        livenessProbe:
+          httpGet:
+            path: /liveness
+            port: backend-port
+        readinessProbe:
+          httpGet:
+            path: /readiness
+            port: backend-port
+        ports:
+        - name: backend-port
+          containerPort: 8080
+        env:
+        - name: ELASTICSEARCH_URL
+          valueFrom:
+            configMapKeyRef:
+              name: elasticsearch-config
+              key: es-url
+        - name: PORT
+          value: "8080"

internal/tools/config/webapp/backend/kustomization.yaml

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+resources:
+- ../../base
+- deployment.yaml
+- service.yaml

internal/tools/config/webapp/backend/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: kustomize-search
+spec:
+  selector:
+    app: kustomize-search
+    tier: backend
+  ports:
+  - protocol: "TCP"
+    port: 80
+    targetPort: backend-port
+  type: LoadBalancer
+  loadBalancerIP: ""