Add prometheus-slurm-exporter to index

pkgs/index.nix

@@ -39,6 +39,7 @@ let
     paraverKernel = callPackage ./paraver/kernel.nix { };
     #pscom = callPackage ./parastation/pscom.nix { }; # Unmaintaned
     #psmpi = callPackage ./parastation/psmpi.nix { }; # Unmaintaned
+    prometheus-slurm-exporter = prev.callPackage ./prometheus-slurm-exporter/default.nix { };
     sonar = callPackage ./sonar/default.nix { };
     stdenvClangOmpss2 = final.stdenv.override { cc = final.clangOmpss2; allowedRequisites = null; };
     stdenvClangOmpss2Nanos6 = final.stdenv.override { cc = final.clangOmpss2Nanos6; allowedRequisites = null; };

pkgs/overlay.nix

@@ -52,6 +52,4 @@ final: prev:
       popd
     '';
   });
-
-  prometheus-slurm-exporter = prev.callPackage ./slurm-exporter.nix { };
 }