feat(templates): add passkeys-backend template

[nicolas-camacho]

Description

Quick deploy template for a sample backend for passkeys using comms API .

Let me know any suggestions or feedback you might have.

Live demo at: https://passkey-demo-5706.twil.io/index.html

Checklist

• I ran npm test locally and it passed without errors.
• I acknowledge that all my contributions will be made under the project's license.

[robinske]

For consistency, let's point people to use webauthn-json instead of writing their own array buffer conversion functions. Here's how I did that if it's useful

Otherwise, I tested locally on web and it works great, I'm going to use this for the demo application!

[cmsunu28]

@nicolas-camacho It looks like we're also having some test failure with this template--
CI template verification › the "passkeys-backend" function template › its .env.example (or .env) file and webhooks › should have a description for each variable
Can you take a look at this and see what you can do? Thank you!

[robinske]

@nicolas-camacho left a few more comments - let me know when you want me to take another look!

[robinske]

just a couple more things! thanks @nicolas-camacho !

[cmsunu28]

Hi all. Still getting failures on the tests unfortunately.

[robinske]

LGTM 👍🏻

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