Bug 1581819 - flip the cron job to build conditioned profiles daily r=dustin

Adds a cron to run the conditioned profiles

Differential Revision: https://phabricator.services.mozilla.com/D46148

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

.cron.yml

@@ -209,3 +209,13 @@ jobs:
           - {weekday: 'Friday', hour: 3, minute: 0}
           - {weekday: 'Saturday', hour: 3, minute: 0}
           - {weekday: 'Sunday', hour: 3, minute: 0}
+
+    - name: condprof
+      job:
+          type: decision-task
+          treeherder-symbol: condprof
+          target-tasks-method: condprof
+      run-on-projects:
+          - mozilla-central
+      when:
+          - {hour: 16, minute: 00}

taskcluster/docs/cron.rst

@@ -68,6 +68,10 @@ and so is undesirable.
         - {weekday: 'Monday', hour: 10, minute: 0}
         - {weekday: 'Thursday', hour: 10, minute: 0}
 
+.. note::
+
+   Times are expressed in UTC (Coordinated Universal Time)
+
 
 Decision Tasks
 ..............

taskcluster/taskgraph/target_tasks.py

@@ -798,3 +798,13 @@ def target_tasks_raptor_tp6m(full_task_graph, parameters, graph_config):
                 return True
 
     return [l for l, t in full_task_graph.tasks.iteritems() if filter(t)]
+
+
+@_target_task('condprof')
+def target_tasks_condprof(full_task_graph, parameters, graph_config):
+    """
+    Select tasks required for building conditioned profiles.
+    """
+    for name, task in full_task_graph.tasks.iteritems():
+        if task.kind == "condprof":
+            yield name