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

Adjusts the release pipeline so GoReleaser creates GitHub releases as drafts, and the workflow publishes the release only at the end of the release process—supporting workflows that need to finish artifact/registry steps before making the release public.

Changes:

• Configure GoReleaser to create GitHub releases as drafts.
• Add a workflow step to publish (undraft) the GitHub release after the registry notification step.

Reviewed changes

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

File	Description
.goreleaser.yaml	Sets release.draft: true so GitHub releases are created as drafts.
.github/workflows/release.yml	Adds a final step to publish the draft GitHub release via gh release edit.

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[Copilot]

Pull request overview

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

[Copilot]

Pull request overview

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