Payload with Basic Auth

[renequez]

given the following scenario:

1. have Payload deployed to a staging environment
2. add Basic Auth to the environment via Traefik/Caddy/nginx whatever
3. have a user with an API key enabled

i cannot make API calls to Payload because there's a headers conflict, as basic auth requires an Authorization: Basic <x> header and payload requires an Authorization: users API-Key <x> header

i think it would be cool to be able to configure the Authorization header when useAPIKey is true on an auth enabled collection. i'm thinking of something like:

auth: {
  useAPIKey: {
    customHeader: "x-api-key"
  }
}

or something similar