try providing rotate-backups version build arg

Dockerfile

@@ -1,14 +1,14 @@
 
 ARG PYTHON_VERSION=3
 ARG ALPINE_VERSION=3.18
-# ARG ROTATE_BACKUPS_VERSION=latest
+ARG ROTATE_BACKUPS_VERSION=latest
 
 FROM python:${PYTHON_VERSION}-alpine${ALPINE_VERSION}
 
 RUN apk update && apk add less
 
 RUN pip install rotate-backups==8.1
-# RUN pip install rotate-backups==${ROTATE_BACKUPS_VERSION}
+RUN pip install rotate-backups==${ROTATE_BACKUPS_VERSION}
 
 RUN mkdir /data