install fractal from source with flatpak

fractal.sh

sudo -i
cat > fractal.sh << EOF
apt install -y flatpak flatpak-builder git tmux 
flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
flatpak remote-add --user --if-not-exists gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo
flatpak install --assumeyes --user gnome-nightly org.gnome.Sdk org.gnome.Platform
flatpak install --assumeyes --user flathub org.freedesktop.Sdk.Extension.rust-stable//20.08
git clone https://gitlab.gnome.org/GNOME/fractal.git
cd fractal
git checkout fractal-next 
git fetch
git pull
cd build-aux/
time flatpak-builder --user --install app org.gnome.FractalNext.Devel.json
EOF
chmod +x fractal.sh
tmux new -s compil './fractal.sh'