Below is the problem that give me Railway when I do "railway up":

[Region: us-west1]

Using Nixpacks

context: ef14477f9dd66e6b5f5580505effdf31

Nixpacks build failed

Nixpacks was unable to generate a build plan for this app.

Please check the documentation for supported languages: https://nixpacks.com

The contents of the app directory are:

usuario-service/

gateway-service/

.gitignore

configuracion-service/

eureka-service/

servicio-service/

venta-service/

config-data/

cliente-service/

agendamiento-service/

moduloCompra-service/

config-service/

Build failed

moduloCompra-service/

config-service/