Update channel_restriction.sh

.travis/channel_restriction.sh

@@ -1,10 +1,12 @@
 #!/usr/bin/env bash
 #
-# Only proceed if we are on one of the channels passed in when calling this file
+# Only proceed if we are on one of the channels passed in, or a tag build
 #
 
 set -ex
 
+[[ -n $CI_TAG ]] && exit 0
+
 eval "$(ci/channel-info.sh)"
 
 for acceptable_channel in "$@"; do