Add Github Action job for creating PyPI releases

.github/workflows/tests.yml

@@ -55,3 +55,28 @@ jobs:
           file: ./Dockerfile
           push: false
           tags: locustio/locust:latest
+
+  release:
+    name: Release to PyPI
+    needs: verify_docker_build
+    if: startsWith(github.event.ref, 'refs/tags')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel
+      - name: Build
+        run: |
+          python setup.py sdist bdist_wheel
+      - name: Publish to PyPI (Test)
+
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.PYPI_API_TOKEN }}