Environment variable to define the judge key using a file

[osmanirosado]

Include the environment variable DMOJ_JUDGE_KEY_PATH to define the path of a file with the judge key.

Compose file as example:

services:
  judge:
    image: dmoj/judge-tier3:latest
    command: ["run", "$BRIDGE_ADDRESS"]
    environment:
      DMOJ_JUDGE_NAME: "$JUDGE_NAME"
      DMOJ_JUDGE_KEY_PATH: /run/secrets/judge_key
    secrets:
      - judge_key
    volumes:
      - "$PROBLEMS_DIR:/problems:ro"
    cap_add:
      - SYS_PTRACE
    restart: unless-stopped

secrets:
  judge_key:
    file: 'judge_key.txt'