feat(nix): flake

flake.nix

@@ -0,0 +1,59 @@
+{
+  # not sure what this is
+  inputs.systems.url = "github:nix-systems/default";
+
+  outputs = {
+    self,
+    nixpkgs,
+    systems,
+    flake-utils,
+    }:
+    # not sure how to use this function
+    flake-utils.lib.eachSystem (import systems) #what is systems?
+    (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+
+        # Set the Erlang version
+        erlangVersion = "erlangR26";
+        # Set the Elixir version
+        elixirVersion = "elixir_1_15";
+
+        erlang = pkgs.beam.interpreters.${erlangVersion};
+        beamPackages = pkgs.beam.packages.${erlangVersion};
+        elixir = beamPackages.${elixirVersion};
+      in  {
+        # this doesn't work for some reason
+        packages."<system>".default = with import <nixpkgs> {}; stdenv.mkDerivation {
+          name = "next-ls";
+          src = self;
+          buildInputs = [
+            erlang
+            elixir
+            pkgs.zig
+          ];
+
+          buildPhase = ''
+            mix local.hex --force
+            mix local.rebar --force
+            mix deps.get
+            BURRITO_TARGET="darwin_arm64" MIX_ENV=prod mix release
+          '';
+
+          installPhase = ''
+            mkdir -p $out/bin
+            cp burrito_out/next_ls_darwin_arm64 $out/bin
+          '';
+        };
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            erlang
+            elixir
+          ];
+        };
+      }
+    );
+}