Bug 2021009 - [ci] Ensure we also set try_config parameter for 'github-push', r=taskgraph-reviewers,bhearsum

Differential Revision: https://phabricator.services.mozilla.com/D288990

Author: ahal

taskcluster/gecko_taskgraph/decision.py

@@ -414,7 +414,7 @@ def get_decision_parameters(graph_config, options):
         task_config_file = os.path.join(os.getcwd(), "try_task_config.json")
 
     # load try settings
-    if "try" in project and options["tasks_for"] == "hg-push":
+    if "try" in project and options["tasks_for"] in ("hg-push", "github-push"):
         set_try_config(parameters, task_config_file)
 
     if options.get("optimize_target_tasks") is not None: