Pass a --collection-id argument through to `flatpak build-export`.
Also add a ‘collection-id’ property to manifest files, which can be used
to set the collection ID on an exported repo (when using --repo) without
having to provide a command line option.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
If branch is unset this is just a nicer way to set a
particular commit. However if both are set, then we verify
that the branch/tag is at that particular commit. This is
a nice way to document that we want to use a particular tag
but still protect against the tag changing or a MITM attack
modifying what that tag means.
Instead of one mega flatpak-builder man page, move the
file format documnentation to its own man page in the
right section, and shorten the flatpak-builder one.
Philip Withnall