Update backup service to use periodic execution with curl

The Dockerfile now uses a loop to run the backup script every 60 seconds. Added `curl` installation and a curl command in `backup.sh` for external script execution. Removed unused echo statements for clarity.

services/backup/Dockerfile

@@ -1,9 +1,9 @@
 FROM ubuntu:latest
 LABEL authors="Jeppe B"
-RUN apt-get update && apt-get install -y cron
+RUN apt-get update && apt-get install -y cron curl
 COPY backup.sh /backup.sh
 RUN chmod +x /backup.sh
 # Set the timezone
 RUN ln -fs /usr/share/zoneinfo/Europe/Copenhagen /etc/localtime
-# Send a message, and run the backup script
-CMD echo "Backup service is running" && /backup.sh
+# Loop sleep, run backup.sh every 60 seconds
+CMD while true; do /backup.sh; sleep 60; done

services/backup/backup.sh

@@ -1,3 +1,7 @@
 # Show the script is running
-echo "Backup script started at $(date)"
-# TODO: Implement the script here
+#echo "Backup script started at $(date)"
+#echo "Auth key: $auth_key"
+# Curl the backup script
+curl -s "https://nnks.truckwash.dk/?internalCronCall=true&script=run&action=cron&auth_key=$auth_key"
+# Show the script has finished
+#echo "Backup script finished at $(date)"