add ocaml overlay back, create justfile

flake.lock

@@ -73,7 +73,7 @@
           "lix"
         ],
         "nixpkgs": [
-          "nixpkgs"
+          "nixpkgs-oc"
         ]
       },
       "locked": {
@@ -122,19 +122,37 @@
         "type": "github"
       }
     },
-    "nixpkgs_2": {
+    "nixpkgs-oc": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
       "locked": {
-        "lastModified": 1733229606,
-        "narHash": "sha256-FLYY5M0rpa5C2QAE3CKLYAM6TwbKicdRK6qNrSHlNrE=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "566e53c2ad750c84f6d31f9ccb9d00f823165550",
+        "lastModified": 1733437725,
+        "narHash": "sha256-ridu0NcO4Dr2TsHqPE+kh58xTHcXg7IHq/FF74KrP/g=",
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "rev": "03b85ffd6c37255829d475f3584f8d8a1556d5f2",
         "type": "github"
       },
       "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
+        "owner": "nix-ocaml",
+        "repo": "nix-overlays",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1733380312,
+        "narHash": "sha256-ywntxT10Om755wkB9tYgJwEwELQZKYAO5WcNuHv1vjI=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
+        "rev": "a772498086eac57d97065a980a21fc0f304e3192",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a772498086eac57d97065a980a21fc0f304e3192",
         "type": "github"
       }
     },
@@ -144,7 +162,7 @@
         "lix": "lix",
         "lix-module": "lix-module",
         "nh": "nh",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs-oc": "nixpkgs-oc"
       }
     },
     "systems": {