[stage-3] add helm chart for simple application

k8s/helm/simple-app/templates/NOTES.txt

@@ -0,0 +1,6 @@
+---------------------------------------------------------
+
+Content of NOTES.txt appears after deploy.
+Deployed version {{ .Chart.AppVersion }}.
+
+---------------------------------------------------------

k8s/helm/simple-app/templates/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: application
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+spec:
+  replicas: {{ .Values.application.replicasCount }}
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}-{{ .Values.environment }}
+      service: application
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}-{{ .Values.environment }}
+        service: application
+    spec:
+      containers:
+        - image: {{ .Values.image.name }}:{{ .Chart.AppVersion }}
+          imagePullPolicy: Always
+          name: application
+          ports:
+            - name: web
+              containerPort: 80
+          resources:
+            {{- toYaml .Values.application.resources | nindent 12 }}
+      terminationGracePeriodSeconds: 30

k8s/helm/simple-app/templates/ingress.yaml

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+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+    - host: app-gw.my.to
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+                port:
+                  number: 80

k8s/helm/simple-app/templates/service.yaml

@@ -0,0 +1,12 @@
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+spec:
+  ports:
+    - name: web
+      port: 80
+  selector:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: application