ci: add pypi publish job

Author: sbidoul

.github/workflows/ci.yml

@@ -3,6 +3,8 @@ name: CI
 on:
   push:
     branches: ["master"]
+    tags:
+      - "[0-9]+.[0-9]+.[0-9]+"
   pull_request:
 
 jobs:
@@ -39,3 +41,21 @@ jobs:
         run: |
           python -m tox
       - uses: codecov/codecov-action@v1
+  deploy:
+    runs-on: ubuntu-latest
+    needs:
+      - pre-commit
+      - tests
+    if: startsWith(github.ref, 'refs/tags')
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - name: Install pypa/build
+        run: python -m pip install build
+      - name: Build a binary wheel and a source tarball
+        run: python -m build --sdist --wheel --outdir dist/
+      - name: Publish distribution 📦 to PyPI
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.pypi_token }}