bug 1457034 - populate release_partner_build_number. r=nthomas

MozReview-Commit-ID: EC4jHIwBWWb

--HG--
extra : rebase_source : 8c1616bc825b51502f72df92b10e0a4904592966

taskcluster/taskgraph/actions/release_promotion.py

@@ -366,6 +366,9 @@ def release_promotion_action(parameters, graph_config, input, task_group_id, tas
         github_token = get_token(parameters)
         partner_config = get_partner_config(partner_url_config, github_token)
 
+    if input.get('release_partner_build_number'):
+        parameters['release_partner_build_number'] = input['release_partner_build_number']
+
     if partner_config:
         parameters['release_partner_config'] = fix_partner_config(partner_config)