support for depends_on

[KunalSin9h]

May be we can spawn different services in separate go-routine and wait for desired dependencies to exists

for _, service := range services {
    go applyService(service)
} 

func applyService(service) {
    for !dependenciesRunning(services.depends_on) {
       time.Sleep(1 * time.Seonds)
    }

    // run current service
}