Would you be interested in moving to github actions and registry for docker image?

[pfeerick]

Firstly I would like to say a big thank you for putting this together... it has been extremely useful when testing out different things on OpenTX and not having to worry about having a build environment that is fragile, or would conflict with other projects.

Given DockerHub no longer offers automatic builds, would you be interested in a PR migrating this over to using Github Actions, and using the Github docker registry instead? All that would be required after merging the PR would be to make the resulting docker image publicly visible, as by default it is only visible to the members of the github project. I can share some screenshots on how to change the setting - it's easy enough to find.

This is how it looks on my repo now : https://github.com/pfeerick/opentx-fw-build/tree/buildx