Add package import magic

configuration/common/default.nix

@@ -33,4 +33,8 @@
   services.openssh.passwordAuthentication = false;
   services.openssh.challengeResponseAuthentication = false;
   services.openssh.permitRootLogin = lib.mkDefault "no";
+
+  nixpkgs.overlays = [
+    (import ../../pkgs/overlay.nix)
+  ];
 }

pkgs/default.nix

@@ -0,0 +1,5 @@
+import <nixpkgs> {
+  overlays = [
+    (import ./overlay.nix)
+  ];
+}

pkgs/overlay.nix

@@ -0,0 +1,3 @@
+self: super: {
+  anycast_healthchecker = self.python3.pkgs.callPackage ./anycast_healthchecker {};
+}