softprops/action-gh-release defaults draft to false, which publishes
the release prematurely before the publish-release job runs. Switch to
gh release upload which only uploads assets without modifying release
state, avoiding both the premature publish and the duplicate draft
release issues caused by the GitHub API not returning drafts via
getReleaseByTag.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Switches the build-server upload steps from the deprecated
actions/upload-release-asset@v1 to softprops/action-gh-release@v2,
which resolves intermittent socket hang up failures when attaching
release assets. Drops the now-unused upload_url output from the
create-draft-release job.
