packet-sd: init at 0.0.3

This is currently being used as part of the NixOS.org infrastructure [1]
and should probably be included here and not just "downstream" (in the
nixops configs).

[1] 26105e7afa/delft/prometheus/packet-sd.nix

pkgs/development/tools/packet-sd/default.nix

@@ -0,0 +1,24 @@
+{ buildGoModule, fetchFromGitHub, lib }:
+buildGoModule rec {
+  pname = "prometheus-packet-sd";
+  version = "0.0.3";
+
+  src = fetchFromGitHub {
+    owner = "packethost";
+    repo = "prometheus-packet-sd";
+    rev = "v${version}";
+    sha256 = "sha256-2k8AsmyhQNNZCzpVt6JdgvI8IFb5pRi4ic6Yn2NqHMM=";
+  };
+
+  vendorSha256 = null;
+
+  subPackages = [ "." ];
+
+  meta = with lib; {
+    description = "Prometheus service discovery for Equinix Metal";
+    homepage = "https://github.com/packethost/prometheus-packet-sd";
+    license = licenses.asl20;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.andir ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -22978,6 +22978,8 @@ julia_15 = callPackage ../development/compilers/julia/1.5.nix {
 
   packet = callPackage ../development/tools/packet { };
 
+  packet-sd = callPackage ../development/tools/packet-sd { };
+
   packet-cli = callPackage ../development/tools/packet-cli { };
 
   pb_cli = callPackage ../tools/misc/pb_cli {};