Add support for feature branch builds on taskcluster

.taskcluster.yml

@@ -53,7 +53,7 @@ tasks:
 # testing only and should not be uploaded to App Stores.
 #
 ###############################################################################
-    - $if: 'tasks_for == "github-push" && event["ref"] == "refs/heads/master"'
+    - $if: 'tasks_for == "github-push" && (event["ref"] == "refs/heads/master" || event["ref"][0:18] == "refs/heads/feature/")'
       then:
         provisionerId: 'aws-provisioner-v1'
         workerType: 'github-worker'
@@ -94,7 +94,7 @@ tasks:
               expires: {$fromNow: '1 month'}
         metadata:
           name: Firefox Reality for Android - Build - Master update
-          description: Building Firefox Reality for Android (via Gradle) - triggered by update to master
+          description: Building Firefox Reality for Android (via Gradle) - triggered by update to master or feature branch
           owner: [email protected]
           source: ${repository}
 ###############################################################################