Configures pushapk to verify beta APK with beta certificate (#2349)

* Provide certificate alias to pushapk payload

* dev

.taskcluster.yml

@@ -45,7 +45,7 @@ tasks:
 
     trust_level:
       # Pull requests on main repository can't be trusted because anybody can open a PR on it, without a review
-      $if: 'tasks_for in ["github-push", "github-release", "cron"] && event.repository.html_url == "https://github.com/mozilla-mobile/fenix"'
+      $if: 'tasks_for in ["github-push", "github-release", "cron"] && event.repository.html_url == "https://github.com/mitchhentges/fenix"'
       then: 3
       else: 1
   in:

automation/taskcluster/lib/tasks.py

@@ -423,6 +423,7 @@ class TaskBuilder(object):
         payload = {
             "commit": True,
             "google_play_track": track,
+            "certificate_alias": 'fenix' if is_staging else 'fenix-{}'.format(track),
             "upstreamArtifacts": [
                 {
                     "paths": apks,