When github.action_ref is not a semver tag (e.g. main), skip binary
download and run vociferate directly via 'go run ./cmd/vociferate' from
the action's own source directory (GITHUB_ACTION_PATH). A conditional
Setup Go step installs the toolchain only on that path.
When pinned to a semver tag (v*), the existing prebuilt binary download
and cache behaviour is unchanged.
This makes the prepare-release workflow self-contained on main — it no
longer requires a published release to bootstrap itself.
- action.yml: clarify that version-file triggers version-file-based
resolution and that omitting it causes the version to be derived from
the changelog; note version-pattern is only required when version-file
is set.
- README: replace stale reference to the plain-text release-version file
as the default with an accurate description of changelog-based
versioning as the default, directing users to set version-file and
version-pattern only for repos with source-embedded versioning.
