fix non-update build-script if package installed with no-url (skip build)

assets/var/gnu/cups/s6.md

@@ -0,0 +1,15 @@
+<pkgname>/s6
+=
+
+
+``` sh *** set ***
+pkgname_flat=${pkgname//\//\~}
+pkgname_flat=${pkgname_flat%\~s6}
+ln -sf $(pwd) /pkg/gnu/s6/etc/service/current/$pkgname_flat
+s6-svscanctl -h /pkg/gnu/s6/etc/service/current
+```
+
+``` sh *** off ***
+pkgname_flat=${pkgname//\//\~}
+rm /pkg/gnu/s6/etc/service/current/$pkgname_flat
+```

assets/var/gnu/cups/s6/.pkgdata/run

@@ -0,0 +1,2 @@
+#!/pkg/gnu/bin/zsh
+cupsd -f