Wrote release guide

docs/index.rst

@@ -51,4 +51,5 @@ Using STIPS
   basic_tutorial
   examples
   bugs
+  release
   help

docs/release.rst

@@ -0,0 +1,155 @@
+******************************
+Developer Release Instructions
+******************************
+
+This page offers a complete walkthrough on how to prepare and release a new
+version of STIPS on GitHub and PyPI, as well as how to sync the ReadTheDocs
+documentation with the new release.
+
+Pre-merge instructions
+======================
+
+Pull request checklist
+----------------------
+
+In addition to addressing any byproducts of the code review, you should be able
+to answer "yes" to all of the following questions before merging a pull request
+intended for a release:
+
+* Has ``setup.cfg`` been updated to reflect the release's new version number?
+
+* If any dependencies have changed, have you updated them in all applicable files? These include:
+
+    * ``setup.cfg``
+    * ``environment.yml``
+    * ``environment_dev.yml``
+    * ``docs/installation.rst``
+
+* Are you able to install the new version of STIPS locally with ``pip`` and ``conda``?
+
+* Can you run the example notebooks in the ``notebooks/`` directory without encountering errors?
+
+* Has ``CHANGES.rst`` been updated to include the current release and its associated updates at the top?
+
+* Are all CI tests in the release's pull request passing?
+
+* Has at least one developer given the pull request an official approval on GitHub?
+
+Once you've completed the checklist, merge the pull request and begin the
+release procedure in earnest.
+
+Post-merge instructions
+=======================
+
+Tagging the merge commit
+------------------------
+
+Apply a tag to the merge commit, substituting in the proper version number.
+
+.. code-block:: text
+
+    git tag -s vX.Y.Z -m "Release vX.Y.Z"
+
+.. note::
+   The ``-s`` option allows you to sign the tag using the GNU Privacy Guard (GPG).
+   While it's not strictly necessary, it's a good security measure.
+   Follow GitHub's documentation for `creating a GPG key <https://docs.github.com/en/authentication/managing-commit-signature-verification/generating-a-new-gpg-key>`_
+   and `adding it to your account <https://docs.github.com/en/authentication/managing-commit-signature-verification/adding-a-gpg-key-to-your-github-account>`_
+   if you don't have one.
+
+Next, push the tag online. (If your remote that points to ``spacetelescope``'s
+online version of the repository is not named ``origin``, be sure to substitute
+its name in below.)
+
+.. code-block:: text
+
+    git push origin vX.Y.Z
+
+Release creation (on GitHub)
+----------------------------
+
+After the tests triggered by pushing the new tag succeed, follow these steps to
+manually create a new release in the ``STScI-STIPS`` GitHub repository.
+
+#. Click "Releases" on main repository page or `follow this link <https://github.com/spacetelescope/STScI-STIPS/releases>`_.
+#. Press the "Draft a new release" button above the list of releases.
+#. Press "Choose a tag" and select the one you just pushed online. The target branch should already be selected as ``main``.
+#. Press "Generate release notes" to list the commits included in this release.
+#. In the "Release title" textbox, type ``Release X.Y.Z``, substituting in the proper version number.
+#. Above the list of commits in the larger textbox for comments, write a single-sentence summary of the release's major updates.
+#. Press "Publish" to complete this section.
+
+Release creation (for PyPI)
+---------------------------
+
+Continue by building wheel and source distribution files to publish to PyPI so
+users can ``pip`` install STIPS without cloning the repository. You will need a
+PyPI account and maintainer status on `the STIPS project <https://pypi.org/project/stips/>`_
+if you don't already have it there.
+
+.. note::
+
+  It's highly recommended that you clone a new copy of the ``STScI-STIPS``
+  repository into a new directory on your system and work from there while
+  completing this section.
+
+
+Make sure you've installed the necessary packages for this procedure:
+
+.. code-block:: text
+
+    pip install --user --upgrade setuptools wheel twine
+
+Then, identify the largest subdirectories in your STIPS directory:
+
+.. code-block:: text
+
+    du -h
+
+Due to past commits that included large files, STIPS' ``.git/`` subdirectory
+will likely be the largest at over 200 MB. Even with compression, working with
+the repository as is generates distribution files that surpass PyPI's file size
+limit for uploads.
+
+Since the files in ``.git/`` aren't necessary for users to download as part of
+a pip installation, delete them before building anything:
+
+.. code-block:: text
+
+    rm -r .git
+
+Now, create the wheel and source distribution files:
+
+.. code-block:: text
+
+    python setup.py sdist bdist_wheel
+
+The resulting wheel file and tarball are located in the ``dist`` directory.
+
+Finally, upload them to PyPI. :
+
+.. code-block:: text
+
+    python setup.py sdist bdist_wheel
+
+Note that PyPI uploads now require an API token.
+`Refer to their instructions <https://pypi.org/help/#apitoken>`_ if you haven't
+yet set one up.
+
+While the official release is now complete, keep reading for instructions on
+updating the documentation on ReadTheDocs.
+
+Documentation
+=============
+
+Navigate to `the active STIPS ReadTheDocs page <https://readthedocs.org/projects/stips/>`_.
+(Note that the RTD project name is ``stips``, matching the package name but not
+the GitHub repository name.) Verify that new builds of ``latest`` and
+``vX.Y.Z`` have been run successfully. If not, build them manually under the
+"Build a version" header. If you followed earlier instructions, the release
+commit will be the repository's current latest commit, so both versions should
+be identical for the moment.
+
+The versions of the documentation that should be visible to the public and
+marked as "Active" on their "Edit" pages are ``latest`` and the new release,
+``vX.Y.Z``. In the future, we may make past versions visible, too.