chore(build): Add nixery-popcount to top-level package set

default.nix

@@ -53,6 +53,8 @@ in rec {
     exec ${nixery-server}/bin/server
   '';
 
+  nixery-popcount = callPackage ./popcount { };
+
   # Container image containing Nixery and Nix itself. This image can
   # be run on Kubernetes, published on AppEngine or whatever else is
   # desired.

popcount/default.nix

@@ -0,0 +1,26 @@
+# Copyright 2019 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+{ go, stdenv }:
+
+stdenv.mkDerivation {
+  name = "nixery-popcount";
+
+  buildInputs = [ go ];
+  phases = [ "buildPhase" ];
+  buildPhase = ''
+    mkdir -p $out/bin
+    go build -o $out/bin/popcount ${./popcount.go}
+  '';
+}