Add initial backup service with Docker and scripts

This commit introduces a Dockerized backup service, including a Dockerfile, a placeholder `backup.sh` script, and a functional `database_export.sh` script for creating database backups. The setup ensures required validations and dependencies for safely exporting database content. Further implementation is needed in `backup.sh`.

services/backup/Dockerfile

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+FROM ubuntu:latest
+LABEL authors="Jeppe B"
+RUN apt-get update && apt-get install -y cron
+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

services/backup/backup.sh

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+# Show the script is running
+echo "Backup script started at $(date)"
+# TODO: Implement the script here

services/backup/scripts/database_export.sh

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+# Create a database backup
+# Usage: backup.sh <host> <port> <database> <backup_dir> <backup_file> <user> <password>
+
+# Check if the host is provided
+if [ -z "$1" ]; then
+  echo "Host is not provided"
+  exit 1
+fi
+
+# Check if the port is provided
+if [ -z "$2" ]; then
+  echo "Port is not provided"
+  exit 1
+fi
+
+# Check if the database is provided
+if [ -z "$3" ]; then
+  echo "Database is not provided"
+  exit 1
+fi
+
+# Check if the backup directory is provided
+if [ -z "$4" ]; then
+  echo "Backup directory is not provided"
+  exit 1
+fi
+
+# Check if the backup file is provided
+if [ -z "$5" ]; then
+  echo "Backup file is not provided"
+  exit 1
+fi
+
+# Check if the user is provided
+if [ -z "$6" ]; then
+  echo "User is not provided"
+  exit 1
+fi
+
+# Check if the password is provided
+if [ -z "$7" ]; then
+  echo "Password is not provided"
+  exit 1
+fi
+
+# Check if the backup directory exists
+if [ ! -d "$4" ]; then
+  echo "Backup directory $4 does not exist"
+  exit 1
+fi
+
+# Check if the backup file exists
+if [ -f "$4"/"$5" ]; then
+  echo "Backup file $4/$5 already exists"
+  exit 1
+fi
+
+# Check if the database exists
+if ! mysql --host "$1" -P "$2" -u "$6" -p "$7" -e "use $3"; then
+  echo "Database $3 does not exist"
+  exit 1
+fi
+
+# Create a backup file
+mysqldump --host "$1" -P "$2" -u "$6" -p "$7" "$3" > "$4"/"$5"
+
+# Check if the backup file is created
+if [ ! -f "$4"/"$5" ]; then
+  echo "Backup file is not created"
+  exit 1
+fi
+
+# Print the backup file path
+echo "Backup file is created: $4/$5"