From the root directory of the project, run:
docker build -f misc/docker/Dockerfile -t interpretercontainer .
This will create the interpretercontainer container. Then
docker run -it interpretercontainer
If you want to execute rpg programs from your current directory, you can mount it in the /rpg directory of the container:
docker run -it -v $PWD:/rpg interpretercontainer
You can find a prebuilt docker image on dockerhub. Run it, for example, this way:
docker run -it -v $PWD:/rpg rpginterpreter/interpretercontainer