Add elixir env

elixir/.envrc

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+use flake .

elixir/flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1659047633,
+        "narHash": "sha256-zeI+NkJOa665fRrKGpjscfy3Hs4K316q1q7394xbRbw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "496caa738a16d2bb3607243d9127df718bb50513",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

elixir/flake.nix

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+{
+  description = "A Nix-flake-based Elixir development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+
+        inherit (pkgs) darwin inotify-tools mkShell nodejs-18_x terminal-notifier;
+        inherit (pkgs.beam.packages.erlangR25) elixir;
+        inherit (pkgs.lib) optionals;
+        inherit (pkgs.stdenv) isDarwin isLinux;
+
+        linuxDeps = optionals isLinux
+          [ inotify-tools ];
+        darwinDeps = optionals isDarwin
+          [ terminal-notifier ] ++ (with darwin.apple_sdk.frameworks; [ CoreFoundation CoreServices ]);
+      in {
+        devShells = {
+          default = mkShell {
+            buildInputs = [ elixir nodejs-18_x ] ++ linuxDeps ++ darwinDeps;
+
+            shellHook = ''
+              ${elixir}/bin/mix --version
+              ${elixir}/bin/iex --version
+            '';
+          };
+        };
+      });
+}