Add dehydrate to build prereq's.

source/install_build_prerequisites.sh

@@ -142,8 +142,12 @@ if [ -n "$SUDO_USER" ] && [ "$SUDO_USER" != "root" ]; then
     fi
 fi
 
+# check if dehydrate command is installed
+if ! command -v dehydrate &> /dev/null; then
+    curl -fsSL https://gitea.jde.nz/public/dehydrate/releases/download/latest/install.sh | bash
+fi
 
-
+dehydrate -u
 
 
 print_status "All dependencies installed successfully!"