Add flake lock for jupyter

jupyter/.envrc

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+use flake

jupyter/flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1705316053,
+        "narHash": "sha256-J2Ey5mPFT8gdfL2XC0JTZvKaBw/b2pnyudEXFvl+dQM=",
+        "rev": "c3e128f3c0ecc1fb04aef9f72b3dcc2f6cecf370",
+        "revCount": 571714,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.571714%2Brev-c3e128f3c0ecc1fb04aef9f72b3dcc2f6cecf370/018d13d4-6560-744b-8254-c10a7ef5adef/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

jupyter/flake.nix

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+{
+  description = "A Nix-flake-based Python development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+    forEachSupportedSystem = f:
+      nixpkgs.lib.genAttrs supportedSystems (system:
+        f {
+          pkgs = import nixpkgs {inherit system;};
+        });
+  in {
+    devShells = forEachSupportedSystem ({pkgs}: {
+      default = pkgs.mkShell {
+        packages = with pkgs;
+          [python311 virtualenv]
+          ++ (with pkgs.python311Packages; [pip jupyter pandas numpy matplotlib]);
+      };
+    });
+  };
+}