Update Gerrit permissions for global service users (built at http://cl/893733512)

Added permissions:
  Section [refs/heads/*]:
    Read:
      ALLOW: SLSA Policy Verification Service Accounts
    label-SLSA-Policy-Verified:
      ALLOW: SLSA Policy Verification Service Accounts

groups

diff --git a/groups b/groups
index 0108d47..1fbdb93 100644
--- a/groups
+++ b/groups
@@ -2,6 +2,7 @@
 #
 63e39719427665e83e03530767546a82273651f9	akaros-git-pusher
 71195434036f4569dce12d9e815b7af1f8f26256	Akaros-CLA-Accepted
+9d043ebeaea0b6c0ecb3213bd6df5fa8f4a52ded	SLSA Policy Verification Service Accounts
 global:Anonymous-Users                  	Anonymous Users
 global:Project-Owners                   	Project Owners
 global:Registered-Users                 	Registered Users

project.config

diff --git a/project.config b/project.config
index 5b917e4..e8254b7 100644
--- a/project.config
+++ b/project.config
@@ -35,6 +35,8 @@
 	editTopicName = +force group Project Owners
 	editTopicName = +force group mdb/akaros
 	pushMerge = group akaros-git-pusher
+	label-SLSA-Policy-Verified = -1..+1 group SLSA Policy Verification Service Accounts
+	Read = group SLSA Policy Verification Service Accounts
 [access "refs/meta/config"]
 	exclusiveGroupPermissions = read
 	read = group Project Owners