Add script to restore Postgres from backup

Introduces restore_postgres.sh for Endurain's demo instance to automate restoring the Postgres database from a backup, cleaning logs, pruning Docker images, and restarting containers. Includes usage instructions for scheduling via cron.

aux_scripts/restore_postgres.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# This script is used in Endurain's demo instance.
+
+# This script restores the Postgres database from a backup by replacing
+# the current postgres data folder with a backup copy. It also stops
+# and restarts the Docker containers (deleting current Docker images and
+# fetching new ones) to ensure a clean state. Logs are also cleared.
+
+# To schedule this script to run daily at midnight, add the following line
+# to your crontab (edit crontab with `crontab -e`):
+# 0 0 * * * /opt/containers/endurain/restore_postgres.sh >> /opt/containers/endurain/restore_logfile.log 2>&1
+
+# Exit on any error
+set -e
+
+rm -f /opt/containers/endurain/restore_logfile.log
+
+echo "Stopping Docker containers..."
+docker compose down
+
+echo "Removing unused Docker images..."
+docker image prune -a -f
+
+echo "Removing postgres folder..."
+rm -rf postgres
+
+echo "Removing app.log..."
+rm logs/app.log
+
+echo "Copying postgres_backup to postgres..."
+cp -R postgres_backup postgres
+
+echo "Starting Docker containers..."
+docker compose up -d
+
+echo "Done! Containers are now running."