[Buildroot] FYI: patchew: patchwork with CI support

Dear BR maintainers,

have lately discovered this project. Could be a replacement for our patchwork.

The project source and description [1], patchew in action [2].

[1] https://github.com/patchew-project/patchew
[2] https://patchew.org/

Regards,
Yegor