missing part of Social auth configuration at production environment

[kbc8894]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

The variables SOCIAL_APP_LOGIN_REDIRECT_URL, GOOGLE_CALLBACK_URL, GITHUB_CALLBACK_URL should be changeable

Current Behaviour

It doesn't change.
so, I hard coded GOOGLE_CALLBACK_URL, SOCIAL_APP_LOGIN_REDIRECT_URL variable at cvat/settings/base.py
and build

docker build -t cvat/server:v2.3.0 .

It works.

Possible Solution

some code added at cvat/settings/production.py like cvat/settings/development.py and guide

Steps to Reproduce (for bugs)

1. behind reverse proxy (ex. nginx proxy manager) for ssl.
2. Create docker-compose.override.yml with the following code

version: '3.3'
services:
  cvat_server:
    environment:
      USE_ALLAUTH_SOCIAL_ACCOUNTS: 'True'
      SOCIAL_AUTH_GOOGLE_CLIENT_ID: '<YOUR_GOOGLE_CLIENT_ID>'
      SOCIAL_AUTH_GOOGLE_CLIENT_SECRET: '<YOUR_GOOGLE_CLIENT_SECRET>'
      GOOGLE_CALLBACK_URL: https://cvat.example.com/api/auth/google/login/callback/
      SOCIAL_APP_LOGIN_REDIRECT_URL: 'https://cvat.example.com/auth/login-with-social-app'

4. In a terminal, run the following command

CVAT_HOST=cvat.example.com docker-compose -f docker-compose.yml -f docker-compose.override.yml up -d

Context

Your Environment

• Git hash commit (git log -1):
• Docker version docker version (e.g. Docker 17.0.05):
• Are you using Docker Swarm or Kubernetes?
• Operating System and version (e.g. Linux, Windows, MacOS):
• Code example or link to GitHub repo or gist to reproduce problem:
• Other diagnostic information / logs:
  Logs from `cvat` container