This build depends on the KDE Flatpak SDK, and builds any missing
dependencies manually as source modules.
The flatpak can be built with the following command:
```sh
flatpak-builder --user --force-clean --install-deps-from=flathub \
--ccache --repo=Build/repo --install Build/flatpak \
Meta/CMake/flatpak/org.ladybird.Ladybird.json
```
After building, the flatpak can be run with:
```sh
flatpak run --user --devel org.ladybird.Ladybird
```
If there are issues launching RequestServer, the .pid and .sock files
under $XDG_RUNTIME_DIR may need removed.
```sh
flatpak run --user --command=sh --devel org.ladybird.Ladybird
rm -f $XDG_RUNTIME_DIR/Ladybird.*
```
