Add workflow to publish on PyPI

.github/workflows/publish.yml

@@ -0,0 +1,43 @@
+name: Release
+
+on:
+  push:
+
+jobs:
+  build-n-publish:
+    name: Build and publish Python 🐍 distributions 📦 to PyPI
+    runs-on: ubuntu-latest
+    if: github.repository == 'astropy/pytest-doctestplus'
+
+    steps:
+    - uses: actions/checkout@master
+      with:
+        fetch-depth: 0
+    - uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install python-build and twine
+      run: python -m pip install build twine
+
+    - name: Build package
+      run: python -m build --sdist --wheel .
+
+    - name: List result
+      run: ls -l dist
+
+    - name: Check long_description
+      run: python -m twine check dist/*
+
+    - name: Test package
+      run: |
+        cd ..
+        python -m venv testenv
+        testenv/bin/pip install pytest pytest-doctestplus/dist/*.whl
+        testenv/bin/pytest pytest-doctestplus/tests --doctest-plus --doctest-rst
+
+    - name: Publish distribution 📦 to PyPI
+      if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+      uses: pypa/gh-action-pypi-publish@master
+      with:
+        password: ${{ secrets.pypi_password }}

setup.cfg

@@ -21,6 +21,7 @@ classifiers =
 license = BSD
 description = Pytest plugin with advanced doctest features.
 long_description = file: README.rst
+long_description_content_type = text/x-rst
 keywords = doctest, rst, pytest, py.test
 
 [options]