Add support for REDIS_PASSWORD_FILE

[accent-afk]

Add support for REDIS_PASSWORD_FILE making docker-secrets usable like below

services:
  Valkey:
    image: valkey/valkey:latest
    container_name: Valkey
    user: 1000:1000
    networks:
    - Valkey
    volumes:
      - "./Valkey-Data:/data/"
    environment:
      - "REDIS_PASSWORD_FILE=/run/secrets/Valkey-Password"
networks:
  Valkey:
    name: Valkey
    external: false
secrets:
  Valkey-Password:
    file: ./.Valkey-Password