bug#36551: [META] Run Guix System on Purism Librem 5

[Jonathan Brielmaier]

Missing dependencies of chatty:
Required:
- purple-mm-sms: https://source.puri.sm/Librem5/purple-mm-sms
- carbons: https://github.com/gkdr/carbons
Optional:
- lurch: https://github.com/gkdr/lurch
- purple-matrix: https://github.com/matrix-org/purple-matrix