Need integrated authentication of incoming requests

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**Tell us about your request**
What do you want us to build?

As a web application developer, I need to integrate with identity providers to ensure incoming requests are authenticated. I would prefer if this was available within AppRunner so only authenticated requests make it to your service.

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

I will have to build in auth into the app, which is not a normal pattern - I prefer to keep application logic within the app code itself.

**Additional context**
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