chore: build when publishing

[pauldambra]

We run tests when publishing that assume the lib was built...

So this should fix it

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Sep 23, 2024 2:19pm

[github-actions[bot]]

Size Change: 0 B

Total Size: 2.79 MB

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `dist/all-external-dependencies.js` | 191 kB | | `dist/array.full.js` | 350 kB | | `dist/array.full.no-external.js` | 349 kB | | `dist/array.js` | 165 kB | | `dist/array.no-external.js` | 164 kB | | `dist/exception-autocapture.js` | 10.5 kB | | `dist/external-scripts-loader.js` | 2.35 kB | | `dist/main.js` | 165 kB | | `dist/module.full.js` | 349 kB | | `dist/module.full.no-external.js` | 348 kB | | `dist/module.js` | 165 kB | | `dist/module.no-external.js` | 164 kB | | `dist/recorder-v2.js` | 111 kB | | `dist/recorder.js` | 111 kB | | `dist/surveys-preview.js` | 59.8 kB | | `dist/surveys.js` | 66 kB | | `dist/tracing-headers.js` | 8.36 kB | | `dist/web-vitals.js` | 10.3 kB |

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