ci: build ui stories

[skirtles-code]

The Histoire build for the ui package is currently failing:

Error while collecting story /devtools/packages/ui/storybook/Checkbox.story.vue:
ReferenceError: __vite_ssr_exportName__ is not defined

This error occurs for both story:dev and story:build.

I'm not sure exactly what's causing it, but we're using an old version of Histoire and a newer version of Vite. I've updated Histoire to the latest version and from what I can tell the stories all work correctly with the newer version.

I've also added story:build to the CI job, to help keep it working in future.

[netlify]

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commit: 673a40d