Merge pull request #4224 from silx-kit/update_release_doc

doc: update release note. How to handle workflow resources build failure

Author: payno

CONTRIBUTING.rst

@@ -203,7 +203,12 @@ Create the release
   - Select the release branch as the target.
   - Combine the release notes manually edited from ``CHANGELOG.rst`` with `github automatically generated release notes`_.
 * Press the "Publish release" button to push the new tag to the release branch and trigger the release workflow which builds
-  the documentation, the source tarball, the wheels and the Windows "fat binaries" of the release.
+  the documentation, the source tarball, the wheels and the Windows "fat binaries" of the release. You should see them starting from the `actions page <https://github.com/silx-kit/silx/actions>`_. 
+
+.. note::
+
+  If any step in the release process (such as creating wheels or building documentation) fails, you can cancel the github workflow, delete the github release and the associated tag.
+  Then add new PR(s) and repeat the release operation.
 
 Publish Windows "fat binaries"
 ..............................