Major overhaul of the nix side of things, part II.

flake.lock

@@ -121,6 +121,23 @@
         "type": "github"
       }
     },
+    "nixpkgs-nonflake": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1679437018,
+        "narHash": "sha256-vOuiDPLHSEo/7NkiWtxpHpHgoXoNmrm+wkXZ6a072Fc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "19cf008bb18e47b6e3b4e16e32a9a4bdd4b45f7e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-stable": {
       "locked": {
         "lastModified": 1678872516,
@@ -169,6 +186,7 @@
         "devshell": "devshell",
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
+        "nixpkgs-nonflake": "nixpkgs-nonflake",
         "pre-commit-hooks": "pre-commit-hooks",
         "rust-overlay": "rust-overlay",
         "treefmt-nix": "treefmt-nix"