feat: nix support & github workflow

* nix flake

* workflow

* remove flake-utils

.github/workflows/build.yml

@@ -0,0 +1,12 @@
+name: build
+on: [pull_request, push]
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: cachix/install-nix-action@v19
+      with:
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
+    - run: nix build
+    - run: nix flake check

flake.lock

@@ -0,0 +1,81 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1678775037,
+        "narHash": "sha256-chx0tWnXKpcayPkPY3Qh+2hNwptvX8XE3o+fYZ+GNzg=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "ee59e1c769657b1e27e608f8b981fa8f6b715583",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1676283394,
+        "narHash": "sha256-XX2f9c3iySLCw54rJ/CZs+ZK6IQy7GXNY4nSOyu2QG4=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3db36a8b464d0c4532ba1c7dda728f4576d6d073",
+        "type": "github"
+      },
+      "original": {
+        "id": "flake-utils",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1678703398,
+        "narHash": "sha256-Y1mW3dBsoWLHpYm+UIHb5VZ7rx024NNHaF16oZBx++o=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "67f26c1cfc5d5783628231e776a81c1ade623e0b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1678695923,
+        "narHash": "sha256-rDhiiU8P6sf6mgj5IKgCuTRN9uYeqWr6xl4XLkKnMWg=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "95497533524537b1cc7a2870ce94b0b14503be8b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,69 @@
+{
+  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-22.11;
+
+  inputs.fenix.url = github:nix-community/fenix;
+  inputs.fenix.inputs.nixpkgs.follows = "nixpkgs";
+
+  outputs = { self, nixpkgs, fenix, flake-utils }:
+    let
+      name = "server";
+      pkgs = system: import nixpkgs {
+        inherit system;
+      };
+      shell = pkgs: pkgs.mkShell {
+        inputsFrom = [ self.packages.${pkgs.system}.default ];
+
+        # ---- START package specific dev settings ----
+        LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+        # ---- END package specific dev settings ----
+      };
+      package = pkgs:
+        let
+          toolchain = fenix.packages.${pkgs.system}.minimal.toolchain;
+        in
+          (pkgs.makeRustPlatform {
+            cargo = toolchain;
+            rustc = toolchain;
+          }).buildRustPackage rec {
+            pname = "stardust-xr-${name}";
+            src = ./.;
+
+            # ---- START package specific settings ----
+            version = "20230314";
+            cargoSha256 = "sha256-H6qhpvm6Dqn6EETCtgAcT/iof9ZZHm0ahTkX9cChows=";
+
+            postPatch = ''
+              sk=/build/${pname}-${version}-vendor.tar.gz/stereokit-sys/StereoKit
+              mkdir -p $sk/build/cpm
+              cp ${pkgs.fetchurl {
+                url = "https://github.com/cpm-cmake/CPM.cmake/releases/download/v0.32.2/CPM.cmake";
+                hash = "sha256-yDHlpqmpAE8CWiwJRoWyaqbuBAg0090G8WJIC2KLHp8=";
+              }} $sk/build/cpm/CPM_0.32.2.cmake
+            '';
+
+            CPM_SOURCE_CACHE = "./build";
+
+            nativeBuildInputs = with pkgs; [
+              cmake pkg-config llvmPackages.libcxxClang
+            ];
+
+            buildInputs = with pkgs; [
+              openxr-loader libGL mesa xorg.libX11 fontconfig libxkbcommon
+            ];
+
+            LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
+            # ---- END package specific settings ----
+          };
+    in
+    {
+      overlays.default = final: prev: {
+        stardust-xr.${name} = package final;
+      };
+
+      packages."x86_64-linux".default = package (pkgs "x86_64-linux");
+      packages."aarch64-linux".default = package (pkgs "aarch64-linux");
+
+      devShells."x86_64-linux".default = shell (pkgs "x86_64-linux");
+      devShells."aarch64-linux".default = shell (pkgs "aarch64-linux");
+    };
+}