feat: added ability to change tagmanager and analytics script src

[Reyno-Skeps]

feat: added ability to change tagmanager and analytics script src

🔗 Linked issue

Resolves #404

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Currently, there is no way to change the src of the tag manager script without losing the ability of the id being appended automatically. Changing the src is necessary for server side tagging to work.

This PR adds a new option to the tag manager (and analytics) options to change the src directly. This keeps the current functionality intact while allowing a custom src.

googleTagManager: {
	id: 'GTM-123456',
	src: 'https://gtm.example.com/gtm.js'
},

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[harlan-zw]

Hi, thanks for your work on this. I'm not sure if this is the best solution as there's already a property for overriding the source scriptInput.src.

You mention that you don't want to define the id twice, but this should not be required and is where the issue may lie instead.

// this should just work but I guess isn't
googleTagManager: {
	scriptInput: {
		src: 'https://gtm.example.com/gtm.js?id=GTM-123456',
	},
},

As Nuxt Scripts is focused on improving end-user performance, server-side tagging should be a first-class feature. I'd like to make sure that's the case but I haven't used it personally.

As far as I can tell it's just configuring the server_container_url, but I guess from the original issue you're also proxying the script?

  gtag('config', 'TAG_ID', {
    server_container_url: 'https://analytics.example.com',
  });

Happy to work with you on this and get it moved along if you can provide some insights 🙏