feat(k8s): add Kubernetes Helm chart for emailks service

- Create Helm chart structure with Chart.yaml and values.yaml
- Add deployment template with container configuration and environment variables
- Implement service template for gRPC port exposure
- Add service account template with security configuration
- Include horizontal pod autoscaler template for scaling capabilities
- Add helper templates for naming and label management
- Configure SMTP settings as configurable parameters in values.yaml
- Set up resource limits and requests for container performance
- Implement liveness and readiness probes for health checks
- Add support for existing secrets and custom configurations

charts/values.yaml

@@ -0,0 +1,68 @@
+replicaCount: 1
+
+image:
+  repository: emailks
+  pullPolicy: IfNotPresent
+  tag: ""
+
+imagePullSecrets: []
+nameOverride: ""
+fullnameOverride: ""
+
+serviceAccount:
+  create: true
+  annotations: {}
+  name: ""
+
+podAnnotations: {}
+podLabels: {}
+
+podSecurityContext: {}
+securityContext: {}
+
+service:
+  type: ClusterIP
+  port: 50051
+  targetPort: 50051
+
+resources:
+  limits:
+    cpu: 500m
+    memory: 256Mi
+  requests:
+    cpu: 100m
+    memory: 64Mi
+
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 5
+  targetCPUUtilizationPercentage: 80
+
+nodeSelector: {}
+tolerations: []
+affinity: {}
+
+smtp:
+  host: smtp.example.com
+  port: 587
+  tls: starttls
+  username: ""
+  password: ""
+  fromEmail: noreply@example.com
+  fromName: EmailKS
+  replyTo: ""
+  timeoutSecs: 30
+  heloName: ""
+  allowRequestFrom: false
+
+queue:
+  capacity: 1000
+
+listenAddr: "0.0.0.0:50051"
+
+logLevel: info
+
+existingSecret:
+  name: ""
+  passwordKey: "password"