$ git submodule update --init
$ flatpak-builder .build com.jetbrains.RustRover.yml
$ flatpak-builder --repo=../repo --force-clean .build com.jetbrains.RustRover.yml
$ flatpak --user remote-add --no-gpg-verify local-test-repo ../repo
$ flatpak --user install local-test-repo com.jetbrains.RustRover