Support releasing using Docker

I would really like to make https://github.com/seriousben/dockerized-github-release-notes a first-class feature of this project.

Is this a contribution that would be accepted?

Start by reviewing the dockerized-github-release-notes project linked in the issue and compare its release workflow with this repository. Identify the project entry points and acceptance criteria needed to make Docker-based releasing a first-class feature; the issue names no files or tests, so the scope needs clarification before implementation.

索引モデルが issue の本文から書いたものです。