Issue

The current Dockerfile for the mockoon cli doesn't expose a port. This would be very useful for developers trying to run this image as a service in a gitlab's CI/CD pipeline. Gitlab doesn't allow to specify a port in this feature, they use the exposed port of the Dockerfile, and since there's none, it fails to start the service.

Solution

Expose the port 3000 (I believe it's the default for the mockoon server) on the Dockerfile.