Add publish action

.github/workflows/publish.yaml

@@ -2,22 +2,25 @@ name: Publish package
 
 on:
   workflow_run:
-    workflows: Run tests
+    workflows: Check library
     branches: main
     types: completed
 
 jobs:
   build:
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: |
+      github.event.workflow_run.conclusion == 'success' 
+      && github.event_name == 'push' 
+      && startsWith(github.ref, 'refs/tags')
 
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 
-      - name: Set up Python 3.9
+      - name: Set up Python 3.9.2
         uses: actions/setup-python@v2
         with:
-          python-version: 3.9
+          python-version: 3.9.2
 
       - name: Install pypa/build
         run: python -m pip install build --user
@@ -28,4 +31,5 @@ jobs:
       - name: Publish distribution to PyPI
         uses: pypa/gh-action-pypi-publish@master
         with:
-          password: ${{ secrets.PYPI_API_TOKEN }}
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}