Add nix flake and CI

Author: Anderssorby

.envrc

@@ -0,0 +1,6 @@
+use_flake() {
+  watch_file flake.nix
+  watch_file flake.lock
+  eval "$(nix print-dev-env)"
+}
+use flake

.github/workflows/nix.yml

@@ -0,0 +1,22 @@
+name: "Nix CI"
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/[email protected]
+    - uses: cachix/install-nix-action@v13
+      with:
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
+        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+    - uses: cachix/cachix-action@v10
+      with:
+        name: yatima
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - run: nix build
+    - run: nix flake check

flake.lock

@@ -0,0 +1,37 @@
+{
+  inputs = {
+    utils.url = "github:yatima-inc/nix-utils";
+  };
+
+  outputs =
+    { self
+    , utils
+    }:
+    utils.inputs.flake-utils.lib.eachDefaultSystem (system:
+    let
+      lib = utils.lib.${system};
+      pkgs = utils.nixpkgs.${system};
+      inherit (lib) buildRustProject testRustProject rustDefault filterRustProject;
+      rust = rustDefault;
+      crateName = "sp-ipld";
+      root = ./.;
+    in
+    {
+      packages.${crateName} = buildRustProject { inherit root; };
+
+      checks.${crateName} = testRustProject { doCheck = true; inherit root; cargoTestOptions = options: options ++ [ "--all-features" ]; };
+
+      defaultPackage = self.packages.${system}.${crateName};
+
+      # `nix develop`
+      devShell = pkgs.mkShell {
+        inputsFrom = builtins.attrValues self.packages.${system};
+        nativeBuildInputs = [ rust ];
+        buildInputs = with pkgs; [
+          rust-analyzer
+          clippy
+          rustfmt
+        ];
+      };
+    });
+}