Mailman API integration for synchronisation of mailing list memberships#279

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tomudding wants to merge 2 commits intoGEWIS:mainfrom tomudding:feature/mailman-api-integration

Commits on May 24, 2024

Add local Mailman 3 instance
tomudding
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Commits on Jun 15, 2024

[WIP] Add initial synchronisation with Mailman
tomudding
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