buildx failed with: ERROR: failed to solve: process "/bin/sh -c apt-get install -y flatpak && flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo && flatpak install flathub org.gnome.Platform && flatpak install flathub net.devolutions.RDMFree" did not complete successfully: exit code: 1