Adding launch options with docker

[dichotommy]

We don't have any code sample showing how to add launch options when using docker. Haven't received any specific request for it, but could still be helpful to document

example:

docker run -it --rm \
    -p 7700:7700 \
    -v $(pwd)/data.ms:/data.ms \
    getmeili/meilisearch:latest
    meilisearch --master-key helloiamthemasterkey