Fill in metadataBase URL for OpenGraph

[torokati44]

This should fix a warning during build.
See: https://nextjs.org/docs/app/api-reference/functions/generate-metadata#metadatabase

[torokati44]

Hmm, actually, is this also occurring on the live deployment on GHA? 🤔

[torokati44]

Oh, probably not, because of the

        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          BASE_URL: https://ruffle.rs

In the workflow YML file.
So, is this not even necessary, or a good idea...? 🤔
If so, feel free to close.

[danielhjacobs]

Can confirm that while npx --no-install next build produces a warning, BASE_URL=https://ruffle.rs npx --no-install next build does not, and that's already noted https://github.com/ruffle-rs/ruffle-rs.github.io/tree/51fba776965b1f5d6daaa0f6cffeee013bafa825?tab=readme-ov-file#configure-url. Personally I have never set it since it didn't seem necessary and the used default seemed fine.