Merge pull request #43 from ru-fu/add-release-info

add information about releases and the release process

RELEASES.md

@@ -0,0 +1,14 @@
+# Releases
+
+Releases are done to PyPI directly from the main branch.
+
+This usually happens after every merge.
+Check the commit log and the date of the latest [PyPI release](https://pypi.org/project/canonical-sphinx-extensions/#history) to see which changes are included.
+
+## Publish a release
+
+To publish a release, first make sure that the version number in `setup.cfg` is increased.
+Otherwise, publishing will give an error.
+
+Then manually trigger the "Publish canonical-sphinx-extensions to PyPI" workflow on the main branch.
+To do so, you must have Write permission on the repository.