Github action simply runs Docker containers. So it is easy to perform the same build locally that Github will do. To handle this, there are two different docker-compose files: one for Github and one for local. The Dockerfile is the same for both.
To run the build locally, start from the root folder of this repo and run the following command:
Note that Github action will run basically the same commands.
Creating a PR against the main branch will trigger the Github action.