Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+Task Graph
+==========
+
++--------------------------------------------------------------------+
+| This page is an import from MDN and the contents might be outdated |
++--------------------------------------------------------------------+
+
+After a change to the Gecko source code is pushed to version-control,
+jobs for that change appear
+on `Treeherder <https://treeherder.mozilla.org/>`__. How does this
+work?
+
+-  A "decision task" is created to decide what to do with the push.
+-  The decision task creates a lot of additional tasks. These tasks
+   include build and test tasks, along with lots of other kinds of tasks
+   to build docker images, build toolchains, perform analyses, check
+   syntax, and so on.
+-  These tasks are arranged in a "task graph", with some tasks (e.g.,
+   tests) depending on others (builds). Once its prerequisite tasks
+   complete, a dependent task begins.
+-  The result of each task is sent to
+   `TreeHerder <https://treeherder.mozilla.org>`__ where developers and
+   sheriffs can track the status of the push.
+-  The outputs from each task, log files, Firefox installers, and so on,
+   appear attached to each task when it completes. These are viewable in
+   the `Task
+   Inspector <https://tools.taskcluster.net/task-inspector/>`__.
+
+All of this is controlled from within the Gecko source code, through a
+process called *task-graph generation*.  This means it's easy to add a
+new job or tweak the parameters of a job in a :ref:`try
+push <Try Server>`, eventually landing
+that change on an integration branch.
+
+The details of task-graph generation are documented :ref:`in the source
+code itself <TaskCluster Task-Graph Generation>`,
+including a some :ref:`quick recipes for common changes <How Tos>`.