Option to build the docker containers before starting

[jtanios]

When using this package to test a custom container, it'd be good to build the containers before starting the service every time the test runs to make sure any new changes to the Dockerfiles are tested.

I think this can be a param to the DockerCompose constructor:
def __init__(self, filepath, compose_file_name="docker-compose.yml", build=False):

If True, it would add a --build option to the docker-compose command inside start()

[tillahoffmann]

That sounds like a good idea. Fancy sending a PR?

[jtanios]

That sounds like a good idea. Fancy sending a PR?

Sure, I'll submit one pretty soon.

[tillahoffmann]

Closing for now as wontfix (see #83 for details), but thank you for the contribution!