[pica-db-backup-rotation] Use 'python:3.8-alpine' as base

pica-db-backup-rotation/Dockerfile

-FROM python:3-slim-buster
+FROM python:3.8-alpine
 
-RUN apt-get update \
-    && apt-get -y upgrade \
-    && apt-get -y install --no-install-recommends cron \
-    && pip3 install rotate-backups python-crontab \
-    && rm -rf /var/lib/apt/lists/*
+RUN pip install --no-cache-dir "rotate-backups<9" "python-crontab<2.5"
 
 COPY start_rotation.py /start_rotation.py
 

pica-db-backup-rotation/docker-compose.yml

@@ -2,7 +2,7 @@ version: "3.7"
 
 services:
   db-backup-rotation:
-    image: registry.picasoft.net/pica-db-backup-rotation:1.2
+    image: registry.picasoft.net/pica-db-backup-rotation:1.3
     container_name: db-backup-rotation
     volumes:
       - /DATA/BACKUP/:/backup/