Reusable workflows found in .github/workflows.
GitHub does not distinguish workflows that should run in this repository,
from reusable workflows that are expected to be called elsewhere.
The only way to tell is that reusable workflows include workflow_call event trigger.
Reusable workflows, like actions, should have a vMajor git ref
such that consumers may pin to a fuzzy version and avoid receiving breaking changes.
To that end, the tag-major workflow will ensure a vMajor ref is kept up to date
in response to pushed tags.
It is recommended in this repository to trigger a release by manually create a GitHub Release, choosing the next version tag, and publishing (ideally using the generated release notes).