updated dockerfile

Dockerfile

@@ -1,13 +1,18 @@
 FROM alpine:3.7
 
 RUN apk add --no-cache mysql-client jq && \
-mkdir /data/config -p && mkdir /data/backups
+mkdir /config && mkdir /backups
 
-ADD backup.sh /data/backup.sh
-ENV DB_BACKUP_HOSTS_FILE=/data/config/backup_hosts.json \
-    DB_BACKUP_FOLDER=/data/backups
+ADD backup.sh /backup.sh
+ADD run.sh /run.sh
+RUN chmod +x /backup.sh && \
+chmod +x /run.sh
 
-VOLUME /data/config
-VOLUME /data/backups
+ENV DB_BACKUP_HOSTS_FILE=/config/backup_hosts.json \
+    DB_BACKUP_FOLDER=/backups \
+    CRON_TIME="0 0 * * *"
 
-ENTRYPOINT "./data/backup.sh"
+VOLUME /config
+VOLUME /backups
+
+CMD ["/run.sh"]

run.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Set Cron
+if [ -n "${NO_CRON}" ]; then
+    echo "NO_CRON set, running once..."
+    ./backup.sh
+else
+    echo "${CRON_TIME} /backup.sh" > /crontab.conf
+    crontab  /crontab.conf
+    echo "=> Running cron job"
+    exec crond -f
+fi