Add branch protection to glob (#1631)

CI now has a `success` job that we can protect on, which should make
auto-merge possible.

Author: tgross35

repos/rust-lang/glob.toml

@@ -6,3 +6,8 @@ bots = []
 
 [access.teams]
 crate-maintainers = 'maintain'
+
+[[branch-protections]]
+pattern = "master"
+ci-checks = ["success"]
+required-approvals = 0