add flake.nix and flake.lock

flake.nix

@@ -0,0 +1,42 @@
+{
+  description = "A simple flake to build pass-secrets and allow it to be added to a NixOS configuration";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11-small";
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      nix,
+    }:
+    let
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
+      forEachSystem = nixpkgs.lib.genAttrs systems;
+
+      overlayList = [ self.overlays.default ];
+
+      pkgsBySystem = forEachSystem (
+        system:
+        import nixpkgs {
+          inherit system;
+          overlays = overlayList;
+        }
+      );
+
+    in
+    rec {
+
+      overlays.default = final: prev: { pass-secrets = final.callPackage ./package.nix { }; };
+
+      packages = forEachSystem (system: {
+        pass-secrets = pkgsBySystem.${system}.pass-secrets;
+        default = pkgsBySystem.${system}.pass-secrets;
+      });
+
+      nixosModules = import ./nixos-modules { overlays = overlayList; };
+
+    };
+}

package.nix

@@ -0,0 +1,24 @@
+{ stdenv }:
+
+let
+  commit = "72dde8b51c10728fc19c646700bb0b1c0ad8c366";
+in
+stdenv.mkDerivation rec {
+  pname = "pass-secrets";
+  version = "2024-06-08";
+  src = fetchgit {
+    url = "https://github.com/nullobsi/pass-secrets";
+    rev = commit;
+    sha256 = "sha256-QP4vBNaFsLCL45Mog1A9438rCqnWgnWmRgVuL35S+4U=";
+  };
+  nativeBuildInputs = [
+    clang
+    cmake
+    sdbus-cpp
+  ];
+  buildPhase = "make -j $NIX_BUILD_CORES";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $TMP/pass-secrets-${builtins.substring 0 7 commit}/build/pass-secrets $out/bin
+  '';
+}