Environment variables

• KRAB_DIR - directory to load configuration from, if not defined, it defaults to the current working directory (default to /etc/krab in docker container)
• DATABASE_URL - PostgreSQL connection string to use when executing actions
• KRAB_AUTH - authentication method, possible values: none, basic (default: none)
• KRAB_AUTH_BASIC_USERNAME - username for basic authentication
• KRAB_AUTH_BASIC_PASSWORD - password for basic authentication