Add k8s configuration example

examples/k8s/README.md

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+# examples/k8s
+
+k8s example shows simple configuration into kubernetes cluster.

examples/k8s/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: relay
+  labels:
+    app.kubernetes.io/name: relay
+    app.kubernetes.io/app: relay
+    app.kubernetes.io/app-kind: smtp-server
+spec:
+  replicas: 3
+  strategy:
+    type: RollingUpdate
+  revisionHistoryLimit: 10
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: relay
+      app.kubernetes.io/app: relay
+      app.kubernetes.io/app-kind: smtp-server
+  template:
+    metadata:
+      labels:
+        app.kubernetes.io/name: relay
+        app.kubernetes.io/app: relay
+        app.kubernetes.io/app-kind: smtp-server
+    spec:
+      terminationGracePeriodSeconds: 30
+      containers:
+        - name: relay
+          image: ghcr.io/teran/relay:v0.2.0
+          env:
+          - name: LOG_LEVEL
+            value: trace
+          - name: ADDR
+            value: :25
+          - name: ENABLE_TLS
+            value: "false"
+          # - name: TLS_ADDR
+          #   value: :465
+          # - name: TLS_CERTIFICATE
+          #   valueFrom:
+          #     secretKeyRef:
+          #       name: relay
+          #       key: tls_certificate
+          # - name: TLS_KEY
+          #   valueFrom:
+          #     secretKeyRef:
+          #       name: relay
+          #       key: tls_key
+          - name: ALLOW_INSECURE_AUTH
+            value: "true"
+          - name: DOMAIN
+            value: "example.org"
+          - name: DRIVER
+            value: printer
+          # - name: DRIVER
+          #   value: mailgun
+          # - name: MAILGUN_API_KEY
+          #   valueFrom:
+          #     secretKeyRef:
+          #       name: relay
+          #       key: mailgun_api_key
+          # - name: MAILGUN_URL
+          #   valueFrom:
+          #     secretKeyRef:
+          #       name: relay
+          #       key: mailgun_url
+          - name: METRICS_ADDR
+            value: :8081
+          imagePullPolicy: IfNotPresent
+          ports:
+            - name: smtp
+              containerPort: 25
+              protocol: TCP
+            # - name: smtps
+            #   containerPort: 465
+            #   protocol: TCP
+            - name: metrics
+              containerPort: 8081
+              protocol: TCP
+          readinessProbe:
+            httpGet:
+              path: /metrics
+              port: metrics
+            timeoutSeconds: 1
+          livenessProbe:
+            httpGet:
+              path: /metrics
+              port: metrics
+            timeoutSeconds: 1
+          resources:
+            requests:
+              memory: 128Mi
+              cpu: 10m
+            limits:
+              memory: 128Mi
+          securityContext:
+            allowPrivilegeEscalation: false
+            readOnlyRootFilesystem: true

examples/k8s/service.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: relay
+  labels:
+    app.kubernetes.io/name: relay
+    app.kubernetes.io/app: relay
+    app.kubernetes.io/app-kind: smtp-server
+spec:
+  ports:
+  - name: smtp
+    port: 25
+    protocol: TCP
+  # - name: smtps
+  #   port: 465
+  #   protocol: TCP
+  selector:
+    app.kubernetes.io/name: relay
+    app.kubernetes.io/app: relay
+    app.kubernetes.io/app-kind: smtp-server
+  type: ClusterIP