Building image doesn't return a working image

[rokcarl]

I cloned this repo, changed requirements.txt to add sentry-auth-google==0.1.0 and built it with docker build -t my-company/sentry .. Then I ran the same setup that I was before able to run with slafs/sentry-docker, but this time I got the following error:

sentry.runner.importer.ConfigurationError: Exception: Error: SENTRY_SECRET_KEY is undefined, run generate-secret-key and set to -e SENTRY_SECRET_KEY

This makes me think that the slafs/sentry-docker image on Docker Hub was built some different way.

What's the easiest way to build this? The Extending this image section of the read me seems a bit excessive.