Forgejo-side counterpart to the GitHub release.yml (ANW-29). Driven by
workflow_dispatch (UI or API) rather than a release-published event, so a
build can be triggered for a test. Builds the release binary natively per
target, runs the test suite first, and publishes the assets to a Forgejo
release via actions/forgejo-release.
Assumed runner labels linux-amd64 / macos-arm64 must match the forge's
act_runner registration; arm64 needs a native Apple Silicon runner. Flagged
to aav -- correct if the topology differs.
