refactor: use lib.mk-jobset from common

nix/default.nix

@@ -53,23 +53,6 @@ let
 
               inherit (nixFmt) nix-fmt;
               nix-fmt-check = nixFmt.check;
-
-              lib = super.lib // {
-                mk-jobset = import ./mk-jobset.nix self;
-              };
-
-              # An attribute set mapping every supported system to a nixpkgs evaluated for
-              # that system. Special care is taken not to reevaluate nixpkgs for the current
-              # system because we already did that in self.
-              pkgsForSystem = super.lib.genAttrs [ "x86_64-linux" "x86_64-darwin" ] (
-                supportedSystem:
-                  if supportedSystem == system
-                  then self
-                  else import ./. {
-                    inherit RustSec-advisory-db;
-                    system = supportedSystem;
-                  }
-              );
             }
       )
     ];

nix/sources.json

@@ -26,9 +26,10 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "common": {
-        "ref": "master",
+        "branch": "basvandijk/refactor-and-optimize-mk-jobset",
+        "ref": "basvandijk/refactor-and-optimize-mk-jobset",
         "repo": "ssh://git@github.com/dfinity-lab/common",
-        "rev": "c022ff9f16ed0b9e3eb4ed97f26b493de3858df7",
+        "rev": "ed0b80ce1f370ead2f67f9827bb3ab5cc38655aa",
         "type": "git"
     },
     "dfinity": {