Add option for port number

vpn.sh

@@ -31,6 +31,7 @@ check_rpi_model 3
 
 # Ask for input for variables
 ask_user "SERVER_PUBLIC_IP" "8.8.8.8" "Enter the public ip-address of the Wireguard server" "str"
+ask_user "SERVER_PORT" "51820" "Enter the port number of the Wireguard server" "str"
 ask_user "SERVER_PUBLIC_KEY" "GQ4G7V+uRFRbqzYTgNHLd58o+RNPUW99L7Nc7mTt2Hs=" "Enter the public key of the Wirguard server" "str"
 ask_user "NETWORK" "172.18.1.0/24" "Enter the network range you want to allow to connect" "str"
 ask_user "RASPBERRY_ADDRESS" "172.18.1.2" "Enter the private ip-address this device should have" "str"
@@ -71,7 +72,7 @@ PrivateKey = $GENERATED_PRIVATE_KEY
 
 [Peer]
 PublicKey = $SERVER_PUBLIC_KEY
-Endpoint = $SERVER_PUBLIC_IP:51820
+Endpoint = $SERVER_PUBLIC_IP:$SERVER_PORT
 AllowedIPs = $NETWORK
 PersistentKeepalive = 25
 EOL