Deploy to TestPyPI on merges to master, to PyPI for releases

Author: hugovk

.github/workflows/deploy.yml

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+name: Deploy
+
+on:
+  push:
+    branches:
+      - master
+  release:
+    types:
+      - published
+
+jobs:
+  build:
+    if: github.repository == 'python-twitter-tools/twitter'
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Cache
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: deploy-${{ hashFiles('**/setup.py') }}
+          restore-keys: |
+            deploy-
+
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: Install dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install -U setuptools twine wheel
+
+      - name: Build package
+        run: |
+          python setup.py --version
+          python setup.py sdist --format=gztar bdist_wheel
+          twine check dist/*
+
+      - name: Publish package to PyPI
+        if: github.event.action == 'published'
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.pypi_password }}
+
+      - name: Publish package to TestPyPI
+        uses: pypa/gh-action-pypi-publish@master
+        with:
+          user: __token__
+          password: ${{ secrets.test_pypi_password }}
+          repository_url: https://test.pypi.org/legacy/

RELEASING.md

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+# Release Checklist
+
+- [ ] Get master to the appropriate code release state.
+
+- [ ] Publish release with new tag like `twitter-x.y.z`:
+      https://github.com/python-twitter-tools/twitter/releases/new
+
+- [ ] Check the tagged
+      [GitHub Actions build](https://github.com/python-twitter-tools/twitter/actions?query=workflow%3ADeploy)
+      has deployed to [PyPI](https://pypi.org/project/twitter/#history)