Add change casaos web ui port

change-casaos-web-ui-port/README.md

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+# Run command
+
+```bash
+bash -c "$(wget -qLO - https://raw.githubusercontent.com/bigbeartechworld/big-bear-scripts/master/change-casaos-web-ui-port/run.sh)"
+```

change-casaos-web-ui-port/run.sh

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+#!/bin/bash
+
+# Ask the user for the new port number
+read -p "Enter the new port number for CasaOS: " new_port
+
+# Check if the input is a valid number
+if ! [[ "$new_port" =~ ^[0-9]+$ ]]; then
+    echo "Error: Please enter a valid port number."
+    exit 1
+fi
+
+# Backup the original configuration file
+cp /etc/casaos/gateway.conf /etc/casaos/gateway.conf.bak
+
+# Change the port number in the configuration file
+sed -i "s/^port=[0-9]\+/port=$new_port/" /etc/casaos/gateway.conf
+
+# Restart the CasaOS Gateway service
+systemctl restart casaos-gateway.service
+
+echo "Port changed and CasaOS Gateway service restarted successfully."