fix: add default route to network config

provision-pi.sh

@@ -46,6 +46,9 @@ network:
     ethernets:
         eth0:
             addresses: [$NET_ADDR]
+            routes:
+                - to: default
+                  via: $DEFAULT_GATEWAY
 EOF
 }
 
@@ -87,10 +90,12 @@ EOF
 read -e -p "Compressed Image file: " IMG_FILE
 read -e -p "SD Card: " SD_CARD
 read -e -p "IP-Address with prefix (comma separated): " NET_ADDR
+read -e -p "Default Gateway: " DEFAULT_GATEWAY
 read -e -p "Username: " username
 read -s -p "Password: " userpw
 echo
 read -e -p "SSH-Key: " ssh_key
+echo
 
 flash_sd "$IMG_FILE" "$SD_CARD"
 enlarge_partition "$SD_CARD"