add API_HOSTAME setting to override the hostname used for OpenAPI schema

[dkliban]

Is your feature request related to a problem? Please describe.

The OpenAPI schema provides a list of servers that currently looks like this in our deployment:

    "servers": [
        {
            "url": "http://pulp-api-svc.pulp-stage.svc.cluster.local:24817/"
        }
    ]

We would like to be able to set the hostname to match that of the gateway that we use to access the API.

The API_HOSTNAME should default to the hostname of the machine it is running on. The value is just the hostname. It is distinct and separate from API_ROOT.

[mdellweg]

@gerrod3 You are working on a different api gateway story. Do you think there is a way without adding new setting?

[gerrod3]

Maybe you could use the HTTP_HOST value in request.META along with HTTP_X_FORWARDED_PROTO to construct the hostname. https://docs.djangoproject.com/en/5.0/ref/request-response/#django.http.HttpRequest