show ports exposed by base image

Show ports exposed via EXPOSE in the Dockerfile in the UI. The user is not allowed to delete this ```--expose``` entry, though they can bind the port to an endpoint using the port binding form.

[finishes #79045292]
cant we remove this line. the default_ports will be an empty array or have elements then the next line with the loop will iterate 0 or n times? I think thats how the each_with_object would work in the service.