fix install script so that it also can update

installation/install-openems.sh

@@ -7,6 +7,26 @@ CYAN='\033[0;36m'
 GREEN='\033[0;32m'
 NC='\033[0m' # No Color
 
+# Check if OpenEMS is already installed
+if [ -f "/usr/lib/openems/openems.jar" ] || [ -d "/var/www/openems/html" ]; then
+    echo -e "${YELLOW}Existing OpenEMS installation detected. Performing update...${NC}"
+    
+    echo -e "${GREEN}Updating OpenEMS JAR...${NC}"
+    # Update JAR file
+    sudo wget -O /usr/lib/openems/openems.jar https://git.mumme-it.de/Mumme-IT/openems-build/raw/branch/main/build/latest/openems-edge.jar
+    
+    echo -e "${GREEN}Updating UI files...${NC}"
+    # Update UI files
+    wget -O ~/openems-ui.zip https://git.mumme-it.de/Mumme-IT/openems-build/raw/main/build/latest/ui.zip
+    sudo unzip -o ~/openems-ui.zip -d /var/www/openems/html
+    sudo rm ~/openems-ui.zip
+    
+    sudo systemctl restart openems
+    echo -e "${GREEN}Update completed successfully!${NC}"
+    exit 0
+fi
+
+# Original installation code continues below for new installations
 host=$(hostname)
 
 read -p "Please enter the host (default: $host): " host_input