Tested hydra job to control release of channel (has to build okay)

release.nix

@@ -89,8 +89,9 @@ in let
     in
       nixpkgs;
 
-in {
+  # jobs - The jobs hydra is to run.
-
+  #
+  jobs = {
     # Tweak the nixos make-channel code to include the upstream channel.
     #
     # 1. Replace the git repo nixpkgs with a copy of the unpacked nixpkgs channel.
@@ -108,7 +109,21 @@ in {
             '' + original.distPhase;
       } );
 
-  overlays = {
+    # tested - Aggregate package set required to built for automatic channel release
+    #
+    tested = pkgs.lib.hydraJob (pkgs.releaseTools.aggregate {
+      name = "ccpkgs-${version}";
+
+      constituents =
+           builtins.attrValues jobs.pkgs
+        ++ builtins.attrValues jobs.temporary;
+
+      meta = {
+        description = "Release-critical builds for the ccpkgs channel";
+        maintainers = with pkgs.lib.maintainers; [ ];
+      };
+    });
+
     # pkgs - Attribute set of overlayed pkgs.
     #
     pkgs =
@@ -123,4 +138,5 @@ in {
       ( map ( name: { inherit name; value = pkgs.${name}; } )
           ( builtins.attrNames ( import ./temporary/all-temporary.nix { } { } ) ) );
   };
-}
+
+in jobs