Supporting extensions

[lutzky]

As can be seen by the numerous forks of this repository, a lot of people would like to pip install some more things as part of the build (I, for one, am interested in https://github.com/redstreet/beancount_reds_plugins).

Options include:

• Everybody forks this repo and maintains their own fork and docker images (status quo)
• We add some of the tooling in this repository (e.g. I can offer a humble pull request to pip3 install -U beancount-reds-plugins)
• We add some kind of configurable, pluggable mechanism by which people can add plugins after-the-fact

WDYT?

[yegle]

Feel free to send PR with the extensions you need.

Preferably they should be pip-installed from PyPI using --require-hashes flag and we manually bump the version and hash.

[lutzky]

Fair enough, https://github.com/yegle/fava-docker/pull/22 does what I think you mean.