How to start dgraph with some data in it?

Yeah but how to I run dgraph at the same time??? I can’t run the dgraph and have it do the alter at the same time, that’s the problem. I need to find a way to alter the schema without running the dgraph or run it it the background in dockerfile.
dockerfile should look something like this:

FROM dgraph
ADD ./Schema ./

RUN #(here dgraph should run in background)

RUN curl "localhost:8080/alter" --silent --request POST /
 --data-binary "@path/to/Schema"