config: restrict submission to release branches to release-managers

Fixes golang/go#24901

Change-Id: I7a29365a0da0ab6ebdc7bfbe529620b475306b9a
Reviewed-on: https://go-review.googlesource.com/107956
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2 files changed
tree: 779c724f4e0bbe7609f93c638d7cc4ba72ce619c
  1. groups
  2. project.config
  3. rules.pl
  4. rules.pl.old