Local development broken on Mac M1

[benthorner]

Relates to: https://www.pivotaltracker.com/story/show/181498273

Celery needs pycurl in order to run, but we've been unable to set this up reliably, especially on new machines with the new Mac M1 chip. It's still possible to run the tests in this repo, but not the app itself locally.

Suggested action

Dockerise running the app i.e. make-run-celery-with-docker.

This is the approach we took with Celery for the API repo. At the same time, we should update the README to describe the environment variables needed to run the publishing task locally e.g. to push to S3.