goodbye "edge" hello "nightly"!

In conversations with edX, we learned that the name "edge" had negative
undertones for historical reasons. Thus, we switch to "nightly", which means
pretty much the same thing.

.github/workflows/sync.yml

@@ -2,7 +2,7 @@ name: Sync with private repo
 
 on:
   push:
-    branches: [ master, edge ]
+    branches: [ master, nightly ]
 
 jobs:
   sync:

.github/workflows/test.yml

@@ -2,9 +2,9 @@ name: Run tests
 
 on:
   push:
-    branches: [ master, edge ]
+    branches: [ master, nightly ]
   pull_request:
-    branches: [ master, edge ]
+    branches: [ master, nightly ]
 
 jobs:
   tests:

docs/tutor.rst

@@ -88,7 +88,7 @@ When making a new Tutor release, increment the:
 - MAJOR version when making a backward-incompatible change (prefixed by "💥" in the changelog, as explained below).
 - MINOR version when making a backward-compatible change.
 
-An optional BRANCH suffix may be appended to the release name to indicate that extra changes were added on top of the latest release. For instance, "x.y.z-edge" corresponds to release x.y.z on top of which extra changes were added to make it compatible with the Open edX master branches (see the :ref:`tutorial on running Tutor Edge <edge>`).
+An optional BRANCH suffix may be appended to the release name to indicate that extra changes were added on top of the latest release. For instance, "x.y.z-nightly" corresponds to release x.y.z on top of which extra changes were added to make it compatible with the Open edX master branches (see the :ref:`tutorial on running Tutor Nightly <nightly>`).
 
 `Officially-supported plugins <https://overhang.io/tutor/plugins>`__ follow the same versioning pattern. As a third-party plugin developer, you are encouraged to use the same pattern to make it immediately clear to your end-users which Open edX versions are supported.
 

docs/tutorials.rst

@@ -9,7 +9,7 @@ Open edX customization
 
    tutorials/theming
    tutorials/edx-platform-settings
-   tutorials/edge
+   tutorials/nightly
 
 System administration
 ---------------------

docs/tutorials/nightly.rst

@@ -0,0 +1,57 @@
+.. _nightly:
+
+Running Open edX on the master branch ("nightly")
+=================================================
+
+Tutor was designed to make it easy for everyone to run the latest release of Open edX. But sometimes, you want to run the latest, bleeding edge version of Open edX. This is what we call "running master", as opposed to running the release branch. Running the master branch in production is strongly **not** recommended, unless you are an Open edX expert and you really know what you are doing. But Open edX developers frequently need to run the master branch locally to implement and test new features. Thus, Tutor makes it easy to run Open edX on the master branch: this is called "Tutor Nightly".
+
+Installing Tutor Nightly
+------------------------
+
+Running Tutor Nightly requires more than setting a few configuration variables: because there are so many Open edX settings, version numbers, etc. which may change between the latest release and the current master branch, Tutor Nightly is actually maintained as a separate branch of the Tutor repository. To install Tutor Nightly, you should install Tutor from the "nightly" branch of the source repository. To do so, run::
+
+    git clone --branch=nightly https://github.com/overhangio/tutor.git
+    pip install -e ./tutor
+
+As usual, it is strongly recommended to run the command above in a `Python virtual environment <https://docs.python.org/3/tutorial/venv.html>`__.
+
+All Tutor plugins that you wish to use should likewise be installed from the "nightly branch". For instance, the `MFE plugin <https://github.com/overhangio/tutor-mfe>`__::
+
+    git clone --branch=nightly https://github.com/overhangio/tutor-mfe.git
+    pip install -e ./tutor-mfe
+
+You can then run the usual ``tutor`` commands ::
+
+    tutor local quickstart
+    tutor local stop
+    tutor dev runserver lms
+    # ...
+
+Upgrading to the latest version of Open edX
+-------------------------------------------
+
+To pull the latest upstream changes, you should first upgrade Tutor Nightly::
+
+    cd ./tutor
+    git pull
+
+Then, you will have to generate a more recent version of the nightly Docker images. Images for running Tutor Nightly are published daily to docker.io (see `here <https://hub.docker.com/r/overhangio/openedx/tags?page=1&ordering=last_updated&name=nightly>`__). You can fetch the latest images with::
+
+    tutor images pull all
+
+Alternatively, you may want to build the images yourself. As usual, this is done with::
+
+        tutor images build all
+
+However, these images include the application master branch at the point in time when the image was built. The Docker layer caching mechanism might cause the ``git clone`` step from the build to be skipped. In such cases, you will have to bypass the caching mechanism with::
+
+    tutor images build --no-cache all
+
+Running Tutor Nightly alongside the latest release
+--------------------------------------------------
+
+When running Tutor Nightly, you usually do not want to override your existing Tutor installation. That's why a Tutor Nightly installation has the following differences from a regular release installation:
+
+- The default Tutor project root is different in Tutor Nightly. By default it is set to ``~/.local/share/tutor-nightly`` on Linux (instead of ``~/.local/share/tutor``). To modify this location check the :ref:`corresponding documentation <tutor_root>`.
+- The plugins root is set to ``~/.local/share/tutor-nightly-plugins`` on Linux (instead of ``~/.local/share/tutor-plugins``). This location may be modified by setting the ``TUTOR_PLUGINS_ROOT`` environment variable.
+- The default docker-compose project name is set to ``tutor_nightly_local`` (instead of ``tutor_local``). This value may be modified by manually setting the ``LOCAL_PROJECT_NAME``.

tutor/__about__.py

@@ -6,8 +6,8 @@
 
 # The version suffix will be appended to the actual version, separated by a
 # dash. Use this suffix to differentiate between the actual released version and
-# the versions from other branches. For instance: set the suffix to "edge" in
-# the edge branch.
+# the versions from other branches. For instance: set the suffix to "nightly" in
+# the nightly branch.
 # The suffix is cleanly separated from the __version__ in this module to avoid
 # conflicts when merging branches.
 __version_suffix__ = ""