Bug 1822689 - Enable Flatpak pushing. r=rjl

Differential Revision: https://phabricator.services.mozilla.com/D194319

--HG--
extra : amend_source : c10a644c730d502db7dd26d9e880d467e0c3ed5b

taskcluster/ci/release-flatpak-push/kind.yml

@@ -16,7 +16,7 @@ kind-dependencies:
 job-defaults:
     description: Pushes Flatpaks onto Flathub
     run-on-projects: []  # to make sure this never runs as part of CI
-    run-on-releases: []
+    run-on-releases: [beta, release]
     shipping-phase: ship
     treeherder:
         platform: linux64/opt