Bug 1589706: Add support worker worker-manager pool aliases; r=Callek

Differential Revision: https://phabricator.services.mozilla.com/D49763

--HG--
extra : moz-landing-system : lando

taskcluster/taskgraph/config.py

@@ -79,7 +79,7 @@ graph_config_schema = Schema({
     Required('workers'): {
         Required('aliases'): {
             text_type: {
-                Required('provisioner'): text_type,
+                Required('provisioner'): optionally_keyed_by('level', text_type),
                 Required('implementation'): text_type,
                 Required('os'): text_type,
                 Required('worker-type'): optionally_keyed_by('level', text_type),

taskcluster/taskgraph/util/workertypes.py

@@ -63,6 +63,10 @@ def _get(graph_config, alias, level):
         raise KeyError("No matches for worker-type alias " + alias)
     worker_config = matches[0].copy()
 
+    worker_config['provisioner'] = evaluate_keyed_by(
+        worker_config['provisioner'],
+        "worker-type alias {} field provisioner".format(alias),
+        {"level": level}).format(level=level, alias=alias)
     worker_config['worker-type'] = evaluate_keyed_by(
         worker_config['worker-type'],
         "worker-type alias {} field worker-type".format(alias),