As a developer I can add container-hosting to an *existing* docker image

**Is your feature request related to a problem? Please describe.**
Sometimes I just need to deploy an app image from a public registry.

**Describe the solution you'd like**
An optional input field for image beside repo.

**Describe alternatives you've considered**
Docker Compose option.

**Additional context**
Add any other context or screenshots about the feature request here.
