[nix] fix VCS daidir write permission issue

Signed-off-by: Avimitin <dev@avimit.in>

templates/chisel/nix/gcd/vcs.nix

@@ -58,6 +58,9 @@ stdenv.mkDerivation (finalAttr: {
     inherit rtl;
 
     tests.simple-sim = runCommand "${binName}-test" { __noChroot = true; } ''
+      cp -r ${finalAttr.finalPackage}/lib/${binName}.daidir .
+      chmod -R +w ${binName}.daidir
+
       # Combine stderr and stdout and redirect them to tee
       # So that we can have log saving to output and also printing to stdout
       ${finalAttr.finalPackage}/bin/${binName} &> >(tee $out)