flatpak-builder
Help build application dependencies.
TLDR
Build a Flatpak and export it to a new repository
$ flatpak-builder [path/to/build_directory] [path/to/manifest]
Build a Flatpak and export it to the specified repository
$ flatpak-builder --repo=[repository_name] [path/to/build_directory] [path/to/manifest]
Build a Flatpak and install it locally
$ flatpak-builder --install [path/to/build_directory] [path/to/manifest]
Build and sign a Flatpak and export it to the specified repository
$ flatpak-builder --gpg-sign=[key_id] --repo=[repository_name] [path/to/manifest]
Run a shell inside of an application sandbox without installing it
$ flatpak-builder --run [path/to/build_directory] [path/to/manifest] [sh]