Add release pipeline GitHub Action (#3954)

* add long description content type
* bump to 3.9.0
* add GitHub release pipeline definition
* be conservative while waiting for PyPI
* address TODOs to make merge-ready

Author: michaelosthege

.github/workflows/release.yml

@@ -0,0 +1,54 @@
+name: release-pipeline
+
+on:
+  release:
+    types:
+      - created
+
+jobs:
+  release-job:
+    runs-on: ubuntu-latest
+    env:
+      PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+    # TODO: ideally, this pipeline should run parallelized tests in upstream jobs..
+    #- name: Install test tooling
+    #  run: |
+    #    pip install pytest pytest-cov nose nose-parameterized
+    #    pip install -r requirements.txt
+    #- name: Run tests
+    #  run: |
+    #    pytest --cov=./pymc3 --cov-report term-missing pymc3/
+    - name: Install release tooling
+      run: |
+        pip install twine wheel
+    - name: Build package
+      run: |
+        python setup.py sdist bdist_wheel
+    - name: Check version number match
+      run: |
+        echo "GITHUB_REF: ${GITHUB_REF}"
+        # The GITHUB_REF should be something like "refs/tags/v3.x.x"
+        # Make sure the package version is the same as the tag
+        grep -Rq "^Version: ${GITHUB_REF:11}$" pymc3.egg-info/PKG-INFO
+    - name: Publish to PyPI
+      run: |
+        twine check dist/*
+        twine upload --repository pypi --username __token__ --password ${PYPI_TOKEN} dist/*
+  test-install-job:
+    needs: release-job
+    runs-on: ubuntu-latest
+    - name: Set up Python
+      uses: actions/setup-python@v1
+      with:
+        python-version: 3.7
+    - name: Give PyPI a chance to update the index
+      run: sleep 240
+    - name: Install from PyPI
+      run: |
+        pip install pymc3==${GITHUB_REF:11}

pymc3/__init__.py

@@ -13,7 +13,7 @@
 #   limitations under the License.
 
 # pylint: disable=wildcard-import
-__version__ = "3.8"
+__version__ = "3.9.0"
 
 import logging
 import multiprocessing as mp

setup.py

@@ -69,6 +69,7 @@ def get_version():
           license=LICENSE,
           url=URL,
           long_description=LONG_DESCRIPTION,
+          long_description_content_type='text/x-rst',
           packages=find_packages(),
           package_data={'docs': ['*']},
           include_package_data=True,