Provide a Github Action

[matiasgarciaisaia]

Instead of having users fetch the script and run it, we may build a Github Action used with uses: to simplify integration.

[ggiraldez]

It seems the current solution fails to detect a failed build. See https://github.com/manastech/code_games/actions/runs/7907702667/job/21585314164
The backend image failed in the docker build stage and the frontend failed while trying to push the image.