0.1.2

ci: publish release assets with a dedicated action, not electron-builder

electron-builder's GitHub uploader put the tiny .blockmap on the release but
silently dropped the 108 MB installer and latest.yml, exiting 0 — leaving a
release with nothing to download and no feed for the auto-updater. Package with
--publish never, then hand the finished files to softprops/action-gh-release,
which uploads large assets reliably and updates the tag's release in place.