Don't modify original file #61
Description
Recently I've been looking into publishing OBS Studio into Flathub directly, and I noticed that the Flatpak builds were generating version numbers with the -modified suffix. OBS generates these version numbers by running git describe --dirty="-modified".
Turns out, this action modifies the original Flatpak manifest file regardless of any actual changes. I think it's probably better to save the modified Flatpak manifest in a separate file, and build from that, instead of modifying the original directly.