ci: publish GoReleaser drafts after artifact upload

[intel352]

Summary

• configure GoReleaser to keep GitHub releases as drafts while artifacts are uploaded
• publish the draft release only after the release workflow completes artifact/registry steps
• keep release workflows compatible with GitHub immutable releases

Verification

• actionlint on changed GoReleaser release workflow
• git diff --check

[Copilot]

Pull request overview

This PR adjusts the release pipeline so that GoReleaser creates GitHub releases as drafts first, and then the workflow explicitly publishes the draft at the end.

Changes:

• Configure GoReleaser to create GitHub releases as drafts (release.draft: true).
• Add a GitHub Actions step that publishes the release by flipping the draft flag off via gh release edit.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.goreleaser.yaml	Sets GoReleaser to create draft GitHub releases.
.github/workflows/release.yml	Publishes the draft release at the end of the workflow using the GitHub CLI.

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