The dispatched build of v0.1.1 kept failing at publish with
'scripts/publish-release.sh: No such file or directory' — the workflow is
read from the dispatch ref (main) but the workspace was the v0.1.1 tag,
whose tree predates scripts/ and .forgejo/.
- second checkout of the workflow's own ref into .ci-tools; publish runs
.ci-tools/scripts/publish-release.sh (and .ci-tools/scripts/release-body.md)
- exclude ./.ci-tools from the build context tar
- target_commitish is now opt-in in publish-release.sh and only set for a
push event, so a re-publish can never move an existing tag
Verified locally end-to-end against a throwaway tag: create, idempotent
re-run (stale assets deleted + replaced), public download, sha256sum -c,
--version. Test release and tag deleted afterwards.