bot: add archive bot #521

Job	Run time
Debian 11 (Python 3.9, backend) (Zulip refs/tags/4.0)	4h 55m 53s
Debian 12 (Python 3.11, backend + documentation) (Zulip refs/tags/7.0)	5m 54s
Ubuntu 22.04 (Python 3.10, backend) (Zulip refs/pull/36159/head)	6m 33s
Ubuntu 24.04 (Python 3.12, backend) (Zulip refs/tags/8.5)	6m 43s
	5h 15m 3s

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