Fixed workflow

.github/workflows/pypi_publish.yml

@@ -3,6 +3,7 @@ name: Publish tag to Pypi
 on:
   release:
     types: [published]
+  workflow_dispatch:
 
 permissions:
   contents: read  #  to fetch code (actions/checkout)
@@ -20,12 +21,11 @@ jobs:
       - name: Install dev tools
         run: |
           pip install -r dev_requirements.txt
-          pip install twine wheel
+          pip install twine wheel build
 
       - name: Build package
         run: |
-          python setup.py build
-          python setup.py sdist bdist_wheel
+          python -m build
 
       - name: Basic package test prior to upload
         run: |