arm64 Docker image?

[macourteau]

Actual Result / Problem

I'd like to run sshportal with Docker on a Raspberry Pi (though this would also apply to running this on a Mac, e.g. an Apple Silicon Mac Mini, or other ARM-based computers). There's only an amd64 image available, so it doesn't start up.

Expected Result / Suggestion

It would be great if the published images also included an arm64 image to run natively on ARM machines.