Add ALLOW_ORIGINS Environment Variable

[harvmaster]

Add ALLOW_ORIGINS environment variable

Adds the ALLOW_ORIGINS environment variable to be set on the docker container. This is important for interfacing with the container from a website using fetch, as the browser will block the contents of the response if the appropriate headers are not present. This change ensures the headers are present on allowed origins.
It imports the middleware package from FastAPI to handle the origin matching.

Example with docker-compose

version: '3.7'

services:
  openai-whisper-asr:
    container_name: whisper
    image: onerahmet/openai-whisper-asr-webservice:latest-gpu
    ports:
      - "9000:9000"
    environment:
      - ASR_MODEL=base
      - ASR_ENGINE=openai_whisper
      - ALLOW_ORIGINS=https://example.com
    deploy:
      resources:
        reservations:
          devices:
            - driver: nvidia
              count: 1
              capabilities: [gpu]

The default behavior is to allow any origins * (Wild cards are supported https://*.example.com)
The variable is comma separated, so adding multiple origins can be done like so:

- ALLOW_ORIGINS=https://example.com, https://second_example.com, https://third_example.com

Docs have also been updated with this information

[ayancey]

Adding support for CORS is a good idea, but should be disabled by default.