Listen to main branch for CQ in prep for main migration

Bug: webrtc:12827
Change-Id: I4178048aa4df7df94d0d253484e90e1024a89023
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/220923
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Christoffer Jansson <jansson@google.com>
diff --git a/commit-queue.cfg b/commit-queue.cfg
index be1baa7..a36fb9e 100644
--- a/commit-queue.cfg
+++ b/commit-queue.cfg
@@ -18,6 +18,7 @@
     projects {
       name: "src"
       ref_regexp: "refs/heads/master"
+      ref_regexp: "refs/heads/main"
     }
   }
   verifiers {