Add valgrind stage

garlic/stages/valgrind.nix

@@ -0,0 +1,23 @@
+{
+  stdenv
+, bash
+, valgrind
+}:
+
+{
+  program
+}:
+
+stdenv.mkDerivation {
+  name = "valgrind";
+  preferLocalBuild = true;
+  phases = [ "installPhase" ];
+  installPhase = ''
+    cat > $out <<EOF
+    #!/bin/sh
+    
+    exec ${valgrind}/bin/valgrind ${program}
+    EOF
+    chmod +x $out
+  '';
+}

overlay.nix

@@ -182,6 +182,7 @@ let
         perf      = callPackage ./garlic/stages/perf.nix { };
         broom     = callPackage ./garlic/stages/broom.nix { };
         envRecord = callPackage ./garlic/stages/envRecord.nix { };
+        valgrind  = callPackage ./garlic/stages/valgrind.nix { };
       };
 
       # Tests (move to bsc ?)