move min-list-garbage into min-collect-garbage pkg

we don't want it in the same package as min-copy-closure as
that depends on bash

pkgs/default.nix

@@ -46,6 +46,7 @@
   openwrt = callPackage ./openwrt {};
 
   initramfs-peek = callPackage ./initramfs-peek {};
+  min-collect-garbage = callPackage ./min-collect-garbage {};
   min-copy-closure = callPackage ./min-copy-closure {};
   hi = callPackage ./hi {};
 }