added volume for cache

restic/docker-compose.yml

@@ -8,6 +8,7 @@ services:
     volumes:
       - ${BACKUP_SOURCE}:/mnt/source:ro 
       - ./data/restic:/root/restic:ro
+      - ./data/cache:/root/.cache/restic
     env_file: .env 
     entrypoint: /root/restic/entry.sh 
     # For debugging, docker-compose run restic