feat: save hostname to file if it doesn't already exist

setup.sh

@@ -280,6 +280,11 @@ prepare_hostname() {
         return
     else
         hostname=$(hostname)
+        # If hostname_file doesn't exist let's also put the hostname in there
+        if [ ! -f "$hostname_file" ]; then
+            echo "$hostname" > "$hostname_file" || die "Failed to save hostname"
+        fi
+
         log_warning "No hostname provided. Defaulting to the currently set hostname on the system. ($hostname)"
         return
     fi