📦 Move PyPI release workflow into the main workflow.

This ensures that any releases are fully tested before publication.

The workflow first builds the distribution files (sdist, wheel) before
using a deployment environment to publish these to PyPI, using the
GitHub actions OpenID support to authenticate with PyPI.

Makefile

@@ -18,6 +18,7 @@ test-parallel: deps
 
 build: clean deps
 	@poetry build
+	@poetry run tox run -e lint_distributions
 
 clean:
 	@rm -rf ./dist