adds the path trick to get singularity in the nix-build env

pkgs/default.nix

@@ -444,6 +444,7 @@ let
 
     testGeneric     =  doDhrun genericTestName;
     testSingularity = (doDhrun "run-singularity").overrideAttrs (o:{
+      buildPhase = "PATH=$PATH:/tmp/argonix/ " + o.buildPhase;
       __noChroot = true; # the test needs OS singularity installation so we disable sanboxing here.
     });
 
@@ -486,20 +487,18 @@ let
     bld = bleeding;
 
 
-    singularityDebugTest = pkgs.stdenv.mkDerivation rec {
-      name = "singdebg";
+    #testSingularity = pkgs.stdenv.mkDerivation rec {
+      #name = "singdebg";
 
-      path = "/run/current-system/sw/bin/";
-
-      src = ../dhrun ;
-      installPhase = ''
-        mkdir -p $out
-        echo $PATH
-        singularity --version
-        singularity --help
-        '';
-      unpackPhase = "true";
-    };
+      #src = ../dhrun ;
+      #installPhase = ''
+        #mkdir -p $out
+        #echo "tata"
+        #PATH=$PATH:/tmp/argonix singularity --version
+        #echo "toto"
+        #'';
+      #unpackPhase = "true";
+    #};
 
   };