If the ref specified in "branch" is actually a tag, we were requiring
that the "commit" property must match "git rev-parse $branch", but
in the case of a tagname that actually expands to the id of the
tag object, not the commit id. We now also try to match against
"rev-parse $branch^{commit}" which expands to the actual commit
object.
We still allow the tag object for backwards compat.
This adds a step to the build process to bundle
the module sources, used for building the flatpak,
as a runtime extension.
The sources can then be installed like the
debug or translation runtime.
This also adds an option to flatpak-builder
for specifying sources directories. One can specify
source dirctories with the use-sources argument. This
will skip the download part of the processing
and will extract the sources from the given sources
directory directly for further processing.
Those source directories do need the same
structure as the ones that flatpak-builder
creates during processing in .flatpak-builder
and which is also used in the exported sources
runtime.
