Infra: Investigate Release Tagging

[sleevi]

We should explore using release tags plus automation as a way of improving the experience for Chairs and Members.

Specifically, the following enhancements can be considered (note: will update this list based on discussion, as well as split into separate issues, the stuff we decide to go forward with)

• Determine the release tag based on the Markdown YAML block version on a commit to the main repository
  • For example, if BR.md changed in the https://github.com/cabforum/servercert repository, and the version in the YAML preamble changed, we should be able to determine the release version of the BRs based on that, and automatically create a tag as appropriate.
• Automate the generation of an IP review notice
  • When a new release tag is added with a specific suffix (e.g. "IPR"), even in a branch (such as used by the WG chair), add a comment to the PR that provides a copy/paste e-mail for the Chair to send for the IP review, with links to download and attach the relevant documents.