Add elm env

elm/.envrc

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+use flake .

elm/flake.lock

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+{
+  "nodes": {
+    "dev": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1659291915,
+        "narHash": "sha256-W1on31THSVnqFf/eC8wxP+oGu1jRpFb7K419w21ijNc=",
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "rev": "41e9f202186994255e28bfa4c518e0c9ffce2bb5",
+        "type": "github"
+      },
+      "original": {
+        "owner": "the-nix-way",
+        "repo": "dev-templates",
+        "type": "github"
+      }
+    },
+    "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": 1659291823,
+        "narHash": "sha256-8GrIQYelrtzEAXDWdfHpAodwrjL08mVES7nRDXSF9fE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4a778d9b98941fe28f0ac4b8400749a16dbb03fe",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "dev": "dev"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

elm/flake.nix

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+{
+  description = "A Nix-flake-based Protobuf development environment";
+
+  inputs = { dev.url = "github:the-nix-way/dev-templates"; };
+
+  outputs = { self, dev }:
+    let inherit (dev.lib) flake-utils nixpkgs;
+    in flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        inherit (pkgs) mkShell;
+
+        elm = pkgs.elmPackages.elm;
+      in {
+        devShells = {
+          default = mkShell {
+            buildInputs = [ elm ] ++ (with pkgs; [ elm2nix ]);
+
+            shellHook = ''
+              echo "elm `${elm}/bin/elm --version`"
+            '';
+          };
+        };
+      });
+}