Install docker and docker-compose on your local machine.
Execute ./run.sh and wait for the stack to be ready (it will take a few seconds as there are health checks for some services).
Doing some changes in either parser or controller and pushing them to the main branch will automatically build a multi-arch image, tag it with :latest and push it into a public registry.
This way, if you want to see how your new changes (or someone else's) behave when you have the full stack created, you just need to run the run.sh and everything that's on the main branch will be reflected in the containers.