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 updates the release pipeline so GoReleaser creates GitHub releases as drafts, and the workflow explicitly publishes (undrafts) the release after GoReleaser completes—supporting artifact upload flows while staying compatible with GitHub’s immutable release behavior.

Changes:

• Configure GoReleaser to create GitHub releases as drafts.
• Add a workflow step to publish the draft GitHub release after the GoReleaser step succeeds.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.goreleaser.yaml	Sets release.draft: true so GitHub releases are initially created as drafts.
.github/workflows/release.yml	Adds a gh release edit ... --draft=false step to publish the draft release after GoReleaser finishes.

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