Add Debian 11 (bullseye) “testing” to the Jami download page

Could you please add Debian 11 (bullseye) “testing” to the Download Jami for GNU/Linux?

This would enable:

Add PureOS to the Jami download page #46 (closed)
[GNOME] Librem 5 phone client https://git.jami.net/savoirfairelinux/ring-client-gnome/issues/950
https://azdle.net/2019/11/comparing-apples-and-gnomes/

Thank you

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