update publish workflow

Author: jacalata

.github/workflows/publish-pypi.yml

@@ -1,9 +1,12 @@
 name: Publish to PyPi
 
-# This will publish a package to TestPyPi (and real Pypi if run on master) with a version
-# number generated by versioneer from the most recent tag looking like v____
-# TODO: maybe move this into the package job so all release-based actions are together
+# This will build a package with a version set by versioneer from the most recent tag matching v____
+# It will publish to TestPyPi, and to real Pypi *if* run on master where head has a release tag
+# For a live run, this should only need to be triggered by a newly published repo release. 
+# This can also be run manually for testing
 on:
+  release:
+    types: [published]
   workflow_dispatch:
   push:
     tags:
@@ -23,7 +26,7 @@ jobs:
       - name: Build dist files
         run: |
           python -m pip install --upgrade pip
-          pip install -e .[test] build
+          python -m pip install -e .[test] build
           python -m build
           git describe --tag --dirty --always