Add notes about making a release

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+
+How to make a psycopg release
+=============================
+
+- Change version number in:
+
+  - ``psycopg_c/psycopg_c/version.py``
+  - ``psycopg/psycopg/version.py``
+
+- Push to GitHub to run `the tests workflow`__.
+
+  .. __: https://github.com/psycopg/psycopg/actions/workflows/tests.yml
+
+- Build the packages by triggering manually the `Build packages workflow`__.
+
+  .. __: https://github.com/psycopg/psycopg/actions/workflows/packages.yml
+
+- If all went fine, create a tag named after the version::
+
+    git tag -a -s 3.0.dev1
+    git push --tags
+
+- Download the ``artifacts.zip`` package from the last Packages workflow run.
+
+- Unpack the packages locally::
+
+    mkdir tmp
+    cd tmp
+    unzip ~/Downloads/artifact.zip
+
+- If the package is a testing one, upload it on TestPyPI with::
+
+    $ twine upload -s -r testpypi *
+
+- If the package is stable, omit ``-r testpypi``.