Switch to using my fork of nixpkgs.

nix/configuration/flake.lock

@@ -39,11 +39,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1756115622,
+        "lastModified": 1756733629,
-        "narHash": "sha256-iv8xVtmLMNLWFcDM/HcAPLRGONyTRpzL9NS09RnryRM=",
+        "narHash": "sha256-dwWGlDhcO5SMIvMSTB4mjQ5Pvo2vtxvpIknhVnSz2I8=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "bafad29f89e83b2d861b493aa23034ea16595560",
+        "rev": "a5c4f2ab72e3d1ab43e3e65aa421c6f2bd2e12a1",
         "type": "github"
       },
       "original": {

nix/configuration/hosts/quark/default.nix

@@ -26,7 +26,7 @@
 
     me.optimizations = {
       enable = true;
-      arch = "znver4"; # build breaks on znver5 currently.
+      arch = "znver5";
       system_features = [
         "gccarch-znver4"
         "gccarch-znver5"

nix/configuration/roles/optimized_build/default.nix

@@ -127,6 +127,13 @@
               );
             })
             # (final: prev: {
+            #   python = prev.python.override {
+            #     packageOverrides = python-final: python-prev: {
+            #       inherit (pkgs-unoptimized.pythonPackages) coverage;
+            #     };
+            #   };
+            # })
+            # (final: prev: {
             #   pythonPackagesOverlays = prev.pythonPackagesOverlays.extend (
             #     final': prev': {
             #       inherit (pkgs-unoptimized.pythonPackagesOverlays)
@@ -135,6 +142,13 @@
             #     }
             #   );
             # })
+            # (final: prev: {
+            #   pythonPackagesExtensions = prev.pythonPackagesExtensions ++ [
+            #     (python-final: python-prev: {
+            #       inherit (pkgs-unoptimized.pythonPackages) coverage;
+            #     })
+            #   ];
+            # })
             (final: prev: {
               inherit (pkgs-unoptimized)
                 gsl