Figure out and document which conventional commit tags warrant a release

[ctreatma]

As mentioned in #22, the release job did not create a release because it didn't find any commits worth releasing. We need to dig into the GitHub Actions used by the release job in order to determine:

• Which conventional commit tags will cause the release job to create a release?
• Can we configure the release job to pay attention to different or additional tags?
• Which tags do we want to use to decide whether a release is needed?

Once we know what configuration to use for the release job, update the GitHub Action workflow and document its behavior in the README.