FEATURE (installation): Allow to launch installation script only under the root

Author: RostislavDugin

README.md

@@ -64,8 +64,9 @@ The installation script will:
 - ✅ Set up automatic startup on system reboot via cron
 
 ```bash
-apt-get install -y curl && \
-curl -sSL https://raw.githubusercontent.com/RostislavDugin/postgresus/refs/heads/main/install-postgresus.sh | bash
+sudo apt-get install -y curl && \
+sudo curl -sSL https://raw.githubusercontent.com/RostislavDugin/postgresus/refs/heads/main/install-postgresus.sh \
+| sudo bash
 ```
 
 ### Option 2: Manual Docker Compose Setup

install-postgresus.sh

@@ -1,5 +1,11 @@
 #!/bin/bash
 
+# Check if script is run as root
+if [ "$(id -u)" -ne 0 ]; then
+    echo "Error: This script must be run as root (sudo ./install-postgresus.sh)" >&2
+    exit 1
+fi
+
 # Set up logging
 LOG_FILE="/var/log/postgresus-install.log"
 INSTALL_DIR="/opt/postgresus"