WIP: ZFS backup implementation

roles/common/templates/zfsbackup/Dockerfile

@@ -0,0 +1,7 @@
+FROM python:3.10-alpine
+RUN \
+    apk add openssh && \
+    pip install zfs-autobackup && \
+    ln -s /run-backup.sh /etc/periodic/daily/
+COPY ["cron.sh", "run-backup.sh", "/"]
+CMD ["/cron.sh"]