Merge #1481: Use a flake instead of shell nix

bd6e6f4 Use a flake instead of shell nix (edouardparis)

Pull request description:

  A flake makes more sense for development with nix declarative systems.
  To launch the shell: do `nix develop`

ACKs for top commit:
  edouardparis:
    Self-ACK bd6e6f4

Tree-SHA512: e9d81ee2e7e6e08a7ea6eca3ae8c5b5d58de517dd5615d6c73578832bd1d2e1e9a9c99781079d48683268fd93647b8a95f70cfafabf818f08321410961ee38f0

flake.nix

@@ -0,0 +1,37 @@
+{
+  description = "Dev shell to help contributing to liana";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in {
+        devShell = pkgs.mkShell rec {
+          buildInputs = with pkgs; [
+            expat
+            fontconfig
+            freetype
+            freetype.dev
+            libGL
+            pkg-config
+            udev
+            wayland
+            libxkbcommon
+            xorg.libX11
+            xorg.libXcursor
+            xorg.libXi
+            xorg.libXrandr
+          ];
+
+          LD_LIBRARY_PATH =
+            builtins.foldl' (a: b: "${a}:${b}/lib") "${pkgs.vulkan-loader}/lib" buildInputs;
+        };
+      }
+    );
+}
+