[Bug]: Cannot run images available only on fleet host

[haringsrob]

Steps to reproduce

We have private images available on our fleet ssh hosts. If we want to use those (without going thorough a registry) we cannot start our services.

Sample workflow:

On the ssh machine

FROM ubuntu

$ docker build . -t some-image-name:v1

On another machine

type: service
name: demo

image: some-image-name:v1
commands:
  - echo 'hi'
port: 8000

model: sample/model

$ dstack apply -f sample.dstack.yml

Actual behaviour

The command fails when getting image metadata

https://github.com/user-attachments/assets/de43df56-dcc9-4939-86fe-0daa3c83563c

Expected behaviour

The service should start using the image available on the machine

dstack version

0.18.43

Server logs

Additional information

perhaps we need a flag/prefix to indicate that these images are not part of a registry.