update package publish instructions

Author: gabrielburnworth

CONTRIBUTING.md

@@ -38,10 +38,43 @@ You can review test coverage by opening `htmlcov/index.html` in a browser.
 
 # Uploading package to PyPI (For FarmBot employees)
 
-Follow [this tutorial](https://packaging.python.org/en/latest/tutorials/packaging-projects/).
+Update the version number in `farmbot/main.py`.
+```python
+VERSION = "2.0.0"
+```
+
+Verify that tests pass and coverage is still at 100%.
+```bash
+coverage run -m unittest discover
+coverage html
+```
+
+Commit and push the version bump (and any other changes already committed).
+```bash
+git add farmbot/main.py
+git commit -m "v2.0.0"
+git push origin main
+```
+Review GitHub Actions, verifying that the `test` workflow has passed,
+and approve the "Publish to TestPyPI" workflow.
+This will upload the package to TestPyPI.
+
+Once the package has been published to TestPyPI,
+install it in a new virtual environment to verify that it works as expected.
+```bash
+python -m venv test_venv
+source test_venv/bin/activate
+python -m pip install requests paho-mqtt
+
+python -m pip install --index-url https://test.pypi.org/simple/ --no-deps --upgrade farmbot
+```
+
+If it does, create and upload a tag.
 ```bash
-python -m pip install --upgrade pip build twine
-rm dist/*
-python -m build
-python -m twine upload dist/*
+git tag v2.0.0
+git push origin v2.0.0
 ```
+
+Approve the "Publish to PyPI" workflow in GitHub Actions. This will upload the package to PyPI and create a GitHub release.
+
+Review the GitHub release, and add a change log to the release notes.