feat: adds nix flake for reproducible builds

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1 +1,2 @@
+.direnv
 build/

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1705697961,
+        "narHash": "sha256-XepT3WS516evSFYkme3GrcI3+7uwXHqtHbip+t24J7E=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e5d1c87f5813afde2dda384ac807c57a105721cc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,56 @@
+{
+  description = "Library Manager";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    system = "x86_64-linux";
+
+    pkgs = import nixpkgs {
+      inherit system;
+    };
+
+    crow = pkgs.stdenv.mkDerivation rec {
+      pname = "crow";
+      version = "1.0+5";
+
+      src = pkgs.fetchFromGitHub {
+        owner = "CrowCpp";
+        repo = "Crow";
+        rev = "v${version}";
+        hash = "sha256-rxA4HgdyY+Pi0M5cGtci6DRR9F947GPD25ut4gvSIP0=";
+      };
+
+      cmakeFlags = [
+        "-DCROW_BUILD_EXAMPLES=OFF"
+        "-DCROW_BUILD_TESTS=OFF"
+      ];
+
+      nativeBuildInputs = with pkgs; [
+        cmake
+        boost
+        openssl
+        zlib
+      ];
+
+      doCheck = false;
+    };
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      buildInputs = with pkgs; [
+        nodejs
+        cargo
+        rustc
+        pkg-config
+        gtk3
+        webkitgtk
+        gnumake
+        boost
+        crow
+      ];
+    };
+  };
+}