Add publishing workflow trigger

References:
* https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#release

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

.github/workflows/publish.yml

@@ -17,6 +17,10 @@
 
 name: Publish
 
+on:
+  release:
+    types: [released]
+
 jobs:
   pypi-publish:
     name: Upload release to PyPI