Adds nix flake

.envrc

@@ -1 +1 @@
-use_nix
+use flake

flake.nix

@@ -0,0 +1,66 @@
+{
+  description = "Nerdgruppe build system";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/release-23.05";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    # required for latest zig
+    zig.url = "github:mitchellh/zig-overlay";
+
+    # Used for shell.nix
+    flake-compat = {
+      url = github:edolstra/flake-compat;
+      flake = false;
+    };
+  };
+
+  outputs =
+    { self
+    , nixpkgs
+    , flake-utils
+    , ...
+    } @ inputs:
+    let
+      overlays = [
+        # Other overlays
+        (final: prev: {
+          zigpkgs = inputs.zig.packages.${prev.system};
+        })
+      ];
+
+      # Our supported systems are the same supported systems as the Zig binaries
+      systems = builtins.attrNames inputs.zig.packages;
+
+    in
+    flake-utils.lib.eachSystem systems (
+      system:
+      let
+        pkgs = import nixpkgs { inherit overlays system; };
+      in
+      rec {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = [
+            pkgs.zigpkgs.master
+            pkgs.pkg-config
+          ];
+
+          buildInputs = [
+            # we need a version of bash capable of being interactive
+            # as opposed to a bash just used for building this flake
+            # in non-interactive mode
+            pkgs.bashInteractive
+          ];
+
+          propagatedBuildInputs = [ ];
+
+          shellHook = ''
+            export SHELL=${pkgs.bashInteractive}/bin/bash
+          '';
+        };
+
+        # For compatibility with older versions of the `nix` binary
+        devShell = self.devShells.${system}.default;
+      }
+    );
+}