The external API is deployed as a 2nd gen Firebase function.
In order to deploy this, first create a Firebase project and set the name in
.firebaserc, or call npx firebase use my-project-name.
Then run npx firebase deploy --only functions:api from the root of the
monorepo, to deploy only this package.
The first time you deploy the function, Firebase will notice that a secret is
being used but not set yet. The CLI will ask you for the value, you can enter
some random string, but you'll need to match it with the apps/web .env.local
setting for NEXT_PUBLIC_DEMO_API_KEY.
Gen2 function runtime parameters can either be defined via env variables or secrets.