Run release workflow on the creation of a tag

Currently the release workflow doesn't run on the creation of a tag, and therefore the wheel isn't deployed to PyPI. This commit should fix that.

Author: EwoutH

.github/workflows/release.yml

@@ -1,6 +1,8 @@
 name: Release
 on:
   push:
+    tags:
+    - '*'
     branches:
     - main
     - release**