The `tag` dispatch input exists so binaries and the homebrew formula can be
rebuilt for a tag that already shipped. It never worked: the job-level
conditions read `inputs.tag`, which is empty in a job `if` on
workflow_dispatch, and `null != ''` coerces to false, so both jobs silently
skipped. That is why v7.0.0 reached crates.io with an empty homebrew tap.
The step-level condition used the same expression and did fire, which is what
made the two disagree. `github.event.inputs.tag` is populated in both places.
Michel de Graaf
fce4b765b7