Add option to set a specific supabase URL on the server side

[jfoucher]

Types of changes

• [ ] Bug fix (a non-breaking change which fixes an issue)
• [x] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This change adds a new configuration option: serverUrl. When set, it overrides the url option on the serverside only when using SSR.

A problem can occur when using nuxt-supabase with SSR in a docker-compose environment. The browser will connect to supabase on the exposed port, e.g. localhost:8000 whereas the server side, running in docker will have to connect to e.g. supabase:8000 This PR allows for setting a different supabase server URL on the browser side and on the server side.

Checklist:

• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes (if not applicable, please state why) I didn't see any tests in the source, nor a way to run any.

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[atinux]

Could you please remove the update on the package.json and lock file?

Can you also update the documentation to explain about your new option? https://supabase.nuxtjs.org/get-started#options (https://github.com/nuxt-modules/supabase/edit/main/docs/content/2.get-started.md)

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[jfoucher]

Requested changes have been made in https://github.com/nuxt-modules/supabase/pull/319/commits/941ef0ee45bb24e61e71b8fd6742faaaea9ce1e4