Move Read permissions to refs/* This may fix errors such as in http://go/bbid/8776299340808051185. Bug: b/289229313 Change-Id: Ie9e7c6873433749214db1c1d241f2940dfccc6c2 Reviewed-on: https://pigweed-review.googlesource.com/c/Public-Projects/+/154290 Reviewed-by: Ted Pudlik <tpudlik@google.com>