Prevent bundling sharp

[bluwy]

Changes

sharp can't be bundled and it fails in runtime if so. It's bundled by default with pnpm unless the user installs sharp themselves.

Testing

I'm updating some dependencies and it causes the Vercel test to OOM, this fixes it.

I also tested this with the ssr example app and it still works.

Docs

n/a. bug fix.

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[ematipico]

Maybe for later, but we should update the relative README.md that explains the plugins.

[bluwy]

Yeah. I think this place isn't quite right to set the external/noExternal too, I'd probably put it in static-build.ts ssrBuild directly, but it's hard to merge it in with the user config.

I could tweak Vite's mergeConfig API so that it works better though and we can put it in that file later though.