Bug 1839317 - Add cron task for Firefox Snap upstream builds r=releng-reviewers,taskgraph-reviewers,ahal

Differential Revision: https://phabricator.services.mozilla.com/D181731

.cron.yml

@@ -394,3 +394,13 @@ jobs:
           - mozilla-central
       when:
           - {hour: 0, minute: 00}
+
+    - name: snap-upstream
+      job:
+          type: decision-task
+          treeherder-symbol: snap-upstream
+          target-tasks-method: snap_upstream_build
+      run-on-projects:
+          - mozilla-central
+      when:
+          - {hour: 0, minute: 0}

taskcluster/gecko_taskgraph/target_tasks.py

@@ -1499,3 +1499,14 @@ def target_tasks_holly(full_task_graph, parameters, graph_config):
         return task.kind == "updatebot"
 
     return [l for l, t in full_task_graph.tasks.items() if filter(t)]
+
+
+@_target_task("snap_upstream_build")
+def target_tasks_snap_upstream_build(full_task_graph, parameters, graph_config):
+    """
+    Select tasks for building snap as upstream. Omit -try because it does not
+    really make sense on m-c
+    """
+    for name, task in full_task_graph.tasks.items():
+        if "snap-upstream-build" in name and not "-try" in name:
+            yield name