repos.json: ignore special in grpc source tree

The source archive of grp contains upwards symlinks (that do not
point outside the source directory). For a normal build this is
not an issue; we still can generate a git tree from this archive
and the parts we use of this archive never even touch a directory
containing an upwards symlink.

However, when just-mr desires to get this root from a just serve
instance, the tree would have to be synced to the remote-execution CAS
and hence the restriction applies that we only consider non-upwards
relative symlinks as first-class citizens.

Therefore, ignore all symlinks in this archive and this way, without
changing the actual build, obtain an easy-to-manage root.

0 files changed, 0 insertions, 0 deletions