Add environment variable to set BASE_PATH in configuration.py

[xanmanning]

---

Desired Behavior

Setting the environment variable BASE_PATH sets the BASE_PATH variable in configuration.py

Used in docker-compose file like below:

---
version: "2.1"
services:
  netbox:
    image: ghcr.io/linuxserver/netbox
    container_name: netbox
    environment:
      - PUID=1000
      - PGID=1000
      - SUPERUSER_EMAIL=<SUPERUSER_EMAIL>
      - SUPERUSER_PASSWORD=<SUPERUSER_PASSWORD>
      - ALLOWED_HOST=<ALLOWED_HOST>
      - BASE_PATH=<BASE_PATH>
      - DB_NAME=<DB_NAME>
      - DB_USER=<DB_USER>
      - DB_PASSWORD=<DB_PASSWORD>
      - DB_HOST=<DB_HOST>
      - DB_PORT=<DB_PORT>
      - REDIS_HOST=<REDIS_HOST>
      - REDIS_PORT=<REDIS_PORT>
      - REDIS_PASSWORD=<REDIS_PASSWORD>
      - TZ=<TZ>
    volumes:
      - <path to data on host>:/config
    ports:
      - 8000:8000
    restart: unless-stopped

Current Behavior

This is available, so you aren't able to host Netbox as https://yourdomain.com/netbox/

Alternatives Considered

Attempted to modify ingress controller in K8s, can't seem to get it to rewrite correctly, causes issues when loading.

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[xanmanning]

PR #8 still waiting for a re-review following changes.