Bug 1646588 - Add esr78 support. r=aki

Differential Revision: https://phabricator.services.mozilla.com/D79731

taskcluster/taskgraph/target_tasks.py

@@ -361,6 +361,36 @@ def target_tasks_mozilla_esr68(full_task_graph, parameters, graph_config):
     return [l for l, t in six.iteritems(full_task_graph.tasks) if filter(t)]
 
 
+@_target_task('mozilla_esr78_tasks')
+def target_tasks_mozilla_esr78(full_task_graph, parameters, graph_config):
+    """Select the set of tasks required for a promotable beta or release build
+    of desktop, plus android CI. The candidates build process involves a pipeline
+    of builds and signing, but does not include beetmover or balrog jobs."""
+
+    def filter(task):
+        if not filter_release_tasks(task, parameters):
+            return False
+
+        if not standard_filter(task, parameters):
+            return False
+
+        platform = task.attributes.get('build_platform')
+
+        # Android is not built on esr78.
+        if platform and 'android' in platform:
+            return False
+
+        test_platform = task.attributes.get('test_platform')
+
+        # Don't run QuantumRender tests on esr78.
+        if test_platform and '-qr/' in test_platform:
+            return False
+
+        return True
+
+    return [l for l, t in six.iteritems(full_task_graph.tasks) if filter(t)]
+
+
 @_target_task('promote_desktop')
 def target_tasks_promote_desktop(full_task_graph, parameters, graph_config):
     """Select the superset of tasks required to promote a beta or release build