feat(ci): publish node Docker image to GHCR on release

[CyberAshven]

Publish the node Docker image on release

Adds .github/workflows/docker-release.yml: on every published release it calls the reusable
build-node workflow in k-nuth/docker-images, which builds and pushes
ghcr.io/k-nuth/kth:<tag> and :latest. So tagging a release is all that's needed — the
image appears under this repo's Packages automatically.

• Authenticates with the built-in GITHUB_TOKEN (packages: write).
• workflow_dispatch is included to (re)build a specific version on demand.

Order: this depends on the companion PR that adds build-node.yml to
k-nuth/docker-images — please merge that one first. After it's in, this can be tried
immediately via the Actions tab (workflow_dispatch) without cutting a release.

[coderabbitai]

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