add flake

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1723637854,
+        "narHash": "sha256-med8+5DSWa2UnOqtdICndjDAEjxr5D7zaIiK4pn0Q7c=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "c3aa7b8938b17aebd2deecf7be0636000d62a2b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,41 @@
+{
+  description = "PVV doorbell matrix bot";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs, ... }@inputs: let
+    forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
+  in {
+    inherit inputs;
+
+    packages = forAllSystems (system: let
+      inherit (pkgs) lib;
+      pkgs = nixpkgs.legacyPackages.${system};
+      package-json = lib.importJSON ./package.json;
+    in {
+
+      default = pkgs.buildNpmPackage {
+        pname = package-json.name;
+        version = package-json.version;
+        meta.homepage = package-json.repository.url;
+        meta.license = lib.getLicenseFromSpdxId package-json.license;
+
+        src = lib.fileset.toSource {
+          root = ./.;
+          fileset = lib.fileset.difference ./. (lib.fileset.unions [
+            ./flake.nix
+            ./flake.lock
+          ]);
+        };
+        npmDepsHash = "sha256-UNc902yMkoWfpun1RrLYlEtOXcFd7uxlwKFWoM0/nTE=";
+
+        postInstall = ''
+          ln -vs /run/secrets/pvv-doorbell-config.json $out/lib/node_modules/$pname/config.json
+        '';
+        dontNpmBuild = true;
+      };
+
+    });
+  };
+
+}