👷 Publish to PyPI on tagging, fixes amitdev#23

Uploads both source and wheels to PyPI upon tagging.
Note this requires generating a PyPI token and adding it to
GitHub secrets naming it `pypi_password` (case doesn't matter).

PyPI token generation:
https://pypi.org/manage/account/token/

GitHub Secrets for the project:
https://github.com/amitdev/lru-dict/settings/secrets/actions/new

After getting it setup and merging, we can (bump a version then) tag
and push to make the wheels available in PyPI.

Also sets `long_description_content_type` to fix a twine check warning:
```
`long_description_content_type` missing. defaulting to `text/x-rst`.
```

Author: AndreMiras

.github/workflows/build-and-deploy.yml

@@ -32,3 +32,21 @@ jobs:
       - uses: actions/upload-artifact@v3
         with:
           path: dist/*.tar.gz
+
+  pypi_upload:
+    name: Publish to PyPI
+    needs: [build_wheels, build_sdist]
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    steps:
+    - uses: actions/setup-python@v2
+    - uses: actions/download-artifact@v3
+      with:
+        name: artifact
+        path: dist
+    - name: Publish package
+      uses: pypa/[email protected]
+      with:
+        verbose: true
+        user: __token__
+        password: ${{ secrets.pypi_password }}

setup.py

@@ -7,6 +7,7 @@
        version = '1.1.7',
        description = 'An Dict like LRU container.',
        long_description = open('README.rst').read(),
+       long_description_content_type="text/x-rst",
        author='Amit Dev',
        url='https://github.com/amitdev/lru-dict',
        license='MIT',