Let developers be able to generate docker image on their local machine.

[pivonroll]

@YoEight
Hi, is there a repository where I could find test data used to fill the database for gRPC Test Data Docker Image?
I was thinking that maybe we can provide developers with the method to generate gRPC Test Data docker image of their desired version of EventStore on their local machine.
That way we could avoid the problem of being stuck with outdated version of gRPC Test Data docker image - EventStore wise.