Setup CI/CD for ActivityWatch Server Docker building

[BeatLink]

Hey, activitywatch server doesnt seem to have a consistently updated docker image on dockerhub. The most recent image on dockerhub (not sure if official) was last updated 2 years ago. I believe that by using CI/CD and automating the docker build process so that a docker image is built for a new release, this would allow the dockerhub images to be kept up to date with any new releases/commits.

[ErikBjare]

The image on dockerhub is not official (I didn't even know it existed).

This has been discussed a few times before (search around). If someone wants to volunteer time to do this that would be great, but I don't personally have the time to maintain yet another CI pipeline :/