Publish images to ghcr.io

[jkroepke]

Is your feature request related to a problem? Please describe.
ttyd images are located at DockerHub. DockerHub has some rate-limits which can be problematic in some situations.

Describe the solution you'd like
Provide an alternative registry where images can be stored. For example, GitHub provides an own Container registry (ghcr.io) which can be used within the repository.

Describe alternatives you've considered

Docker-Sponsored Open Source Program is an alternative to resolve the rate-limits issue on a image basis.

https://docs.docker.com/trusted-content/dsos-program/

Additional context
N/A

[tsl0922]

Good idea, will do it later.