Daemon install script: do not overwrite .env on update

daemon/install/install.sh

@@ -46,7 +46,9 @@ if [ -d "$INSTALL_DIR/dist" ]; then
   rm -rf "$INSTALL_DIR/dist"
 fi
 cp -rv "dist" "$INSTALL_DIR/"
-cp -v ".env.default" "$INSTALL_DIR/.env"
+if [ ! -f "$INSTALL_DIR/.env" ]; then
+  cp -v ".env.default" "$INSTALL_DIR/.env"
+fi
 cp -v "cpu.sh" "$INSTALL_DIR/"
 cp -v "hdd.sh" "$INSTALL_DIR/"
 cp -v "ram.sh" "$INSTALL_DIR/"