Fix upload of known source trees

When a tree is taken from a git root, it is not necessarily known on
the remote site. So, as any missing artifact it has to be uploaded,
recursively uploading the parts to keep the tree invariant. The
function RetrieveToCas was doing the correct recursiv pattern, however
inspecting trees incorrectly using the function ReadTreeInfos; the
latter function, however, was obtaining all the leafs of the tree
as is needed for a compatible action-input description. Add and
use a function that reads the direct contents of a tree.

0 files changed, 0 insertions, 0 deletions