feat(auth): Use bind mount for providers.toml config file

Changed the way the `auth` service source its providers file to use a
bindmount and use a default path if no `PROVIDER_FILE` env is set

docker-compose.yml

@@ -50,18 +50,17 @@ services:
       context: ./src/
       args:
         - SERVICE=auth
-        - EXTRA_FILES=auth/extra
-    container_name: app-auth 
+    container_name: app-auth
     restart: always
     networks:
       - app
     volumes:
       - sqlite-volume:/volumes/database
       - static-volume:/volumes/static
+      - ./src/auth/config:/config
     environment:
       - JWT_SECRET=KRUGKIDROVUWG2ZAMJZG653OEBTG66BANJ2W24DTEBXXMZLSEB2GQZJANRQXU6JA
       - DATABASE_DIR=/volumes/database
-      - PROVIDER_FILE=/extra/providers.toml
     logging:
       driver: gelf
       options: