project.config: allow approvers to set Trust

Change-Id: I293c9499123aac5b086b1e3a0cd8946535c99c8e
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/254419
Reviewed-by: Andrew Bonventre <andybons@google.com>

project.config

diff --git a/project.config b/project.config
index f31eb58..6837695 100644
--- a/project.config
+++ b/project.config
@@ -21,6 +21,7 @@
 	forgeAuthor = group may-forge-author-identity
 	forgeCommitter = group gerritbot
 	label-Code-Review = -2..+2 group approvers
+	label-Trust = 0..+1 group approvers
 	label-Code-Review = -1..+1 group Registered Users
 	submit = group approvers
 	editTopicName = group approvers