Adds 'repository_dispatch' trigger (event-type: runtime-published) so
molecule-core's publish-runtime.yml cascade job can fire this template's
image rebuild after a new molecule-ai-workspace-runtime PyPI release.
Without this, every runtime release waited for the next push: main /
manual workflow_dispatch to propagate to the published image. With it,
runtime fixes flow monorepo → PyPI → all 8 template images
automatically.
Part of the runtime CD chain. See molecule-core docs/workspace-runtime-package.md.
Co-authored-by: Hongming Wang <hongmingwangalt@gmail.com>
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