Call get_lxc_ip explicitly after network is up

Moved the get_lxc_ip call from automatic execution in load_functions to explicit calls in alpine-install.func and install.func, ensuring the LXC IP is retrieved only after the network is up inside the container. Updated comments to clarify usage.

misc/core.func

@@ -38,7 +38,8 @@ load_functions() {
   icons
   default_vars
   set_std_mode
-  get_lxc_ip
+  # Note: get_lxc_ip() is NOT called here automatically
+  # Call it explicitly when you need LOCAL_IP variable
 }
 
 # ------------------------------------------------------------------------------