minimal-bootstrap: separate musl tools from runtime

pkgs/os-specific/linux/minimal-bootstrap/musl/default.nix

@@ -25,6 +25,11 @@ bash.runCommand "${pname}-${version}"
   {
     inherit pname version meta;
 
+    outputs = [
+      "out"
+      "bin"
+    ];
+
     nativeBuildInputs = [
       gcc
       binutils
@@ -87,5 +92,9 @@ bash.runCommand "${pname}-${version}"
     # Install
     make -j $NIX_BUILD_CORES install
     sed -i 's|/bin/sh|${bash}/bin/bash|' $out/bin/*
-    ln -s ../lib/libc.so $out/bin/ldd
+
+    # Don't retain bootstrap bash in libc closure in wrapper
+    mkdir -p $bin
+    mv $out/bin $bin/bin
+    ln -s $out/lib/libc.so $bin/bin/ldd
   ''