Add a docker-compose.yml file for development purposes

[alexandre-abrioux]

Hi!

I though that it could be convenient to allow contributors the option to work with a docker-compose.yml file. Doing so ensures the developer works with the same node version as the one used in production.

No more yarn needed on the developer machine, just docker exec -ti noether sh to get a shell access and easily run tests, etc...

I also updated the .dockerignore file to ignore the docker-compose.yml that will not be needed in the Docker image, as well as other files and dirs that could also be added.

Regarding the compose file, we could also name it docker-compose.dev.yml or docker-compose-dev.yml if you think the current name could lead to confusion for standard users, but it would mean a more verbose command to bootstrap the contributor environment:
docker-compose -f docker-compose.dev.yml up -d instead of the simple docker-compose up -d.

Please tell me if you have any question or you would like to see more improvement to the work I've done. Thanks!

[cf-cartesi]

Looks good. Personally I'd prefer forcing a more verbose invocation by adding -dev or something alike to the docker compose file name, but the default name works too.

[alexandre-abrioux]

Added the suffix :)