Add github automation to build images with the latest tag

[duchenpaul]

I saw image in dockerhub is way out-of-date, suggest creating a Github action to build images and push to ghcr/dockerhub

[tmseidel]

@duchenpaul You're using the wrong URL (old project name), the recent image you'll find here -> https://hub.docker.com/r/tmseidel/ai-git-bot