Use the Mailman REST api to push mailinglist changes
One-sentence description
Use the Mailman REST api to push mailinglist changes
Why?
A new mailinglist sync will make for a more robust implementation
Current implementation
The current syncmailinglist.py is a hacky script which always pulls all the mailing lists from the website. It runs on an interval so it does not always reflect the latest mailinglists.
Desired implementation
Concrexit knows when a mailing list changes and can thus automatically update Mailman via REST api (which has official python bindings). With Celery this can be done in a seperate task to catch any errors. The new REST api is available in Mailman 3, and as we're currently running Mailman 2 I also created a related issue in https://gitlab.science.ru.nl/thalia/serverconfig/issues/204
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