feat: Add grpc_health_probe for ECS health checks

[laurencehook-lr]

Summary

Adds grpc_health_probe to enable native health checks for gRPC services in Kubernetes and AWS ECS.

Usage

Kubernetes

livenessProbe:
  exec:
    command:
    - /bin/grpc_health_probe
    - -addr=localhost:50051
  initialDelaySeconds: 30
  periodSeconds: 10

readinessProbe:
  exec:
    command:
    - /bin/grpc_health_probe
    - -addr=localhost:50051
  initialDelaySeconds: 10
  periodSeconds: 5

AWS ECS

"healthCheck": {
  "command": [
    "CMD-SHELL",
    "/bin/grpc_health_probe -addr=localhost:50051 || exit 1"
  ],
  "interval": 30,
  "timeout": 5,
  "retries": 3,
  "startPeriod": 60
}

Test

docker exec <container_id> /bin/grpc_health_probe -addr=localhost:50051
# Expected: status: SERVING

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