community/firefox: Add screen sharing with Wayland

Enable pipewire WebRTC supported using a patch from Firefox' flatpak version [1]
which allows screen sharing with Wayland.

Note: This requires the packages `pipewire`, `xdg-desktop-portal`, and some
`xdg-desktop-portal-<BACKEND>` to be both installed and running to work.

[1]: https://github.com/xhorak/firefox-devedition-flatpak/tree/master/org.mozilla.FirefoxNightly
7 jobs for !8438 with firefox-pipewire in 3 minutes and 54 seconds
detached
Status Job ID Name Coverage
  Lint
passed #127013
x86_64 docker-alpine
lint

00:00:26

 
  Build
failed #127018
aarch64 ci-build docker-alpine
build-aarch64

00:01:12

failed #127019
armv7 ci-build docker-alpine
build-armv7

00:00:34

failed #127017
ppc64le ci-build docker-alpine
build-ppc64le

00:00:45

failed #127016
s390x ci-build docker-alpine
build-s390x

00:03:26

failed #127015
x86 ci-build docker-alpine
build-x86

00:00:21

failed #127014
x86_64 ci-build docker-alpine
build-x86_64

00:00:22

 
Name Stage Failure
failed
build-s390x Build There has been a runner system failure, please try again
No job log
failed
build-aarch64 Build
No job log
failed
build-ppc64le Build
No job log
failed
build-armv7 Build
No job log
failed
build-x86_64 Build
No job log
failed
build-x86 Build
No job log