📚 User guide: how to release?

[Jannis-Mittenzwei]

See also NC PR exasol/notebook-connector#162

Acceptance Criteria

• PTB User guide describes how to release a project using the PTB
• nox task release:prepare is described
• merge your PR
• switch current branch to the default branch, e.g. "main" or "master": git checkout main/master
• ensure default branch to be up to date: git pull
• git tag "${TAG}"; git push origin "${TAG}"
• GH workflow (workflow: cd.yml) reacts on this tag and starts the release process .

[Jannis-Mittenzwei]

hint: use repository testing-release-robot