add juicity pkg, and modify overlays.

pkgs/default.nix

@@ -6,6 +6,7 @@
 {
   pinentry-selector = pkgs.callPackage ./pinentry-selector.nix { };
   helix = pkgs.callPackage ./helix.nix { inherit inputs; };
+  juicity = pkgs.callPackage ./juicity.nix { };
 }
 // (
   let

pkgs/juicity.nix

@@ -0,0 +1,30 @@
+{ pkgs, ... }:
+pkgs.buildGoModule rec {
+  name = "juicity";
+  version = "unstable-20240514.r132.4af4f68";
+
+  src = pkgs.fetchFromGitHub {
+    repo = "juicity";
+    owner = "juicity";
+    rev = "4af4f68b405a6b86560ebb16963d133a7196af5c";
+    hash = "sha256-4sej/nb7d58+hSCaD6KIfDsqiGmgECPIbRKR65TbMBM=";
+  };
+  env.CGO_ENABLED = 0;
+
+  subPackages = [
+    "cmd/server"
+    "cmd/client"
+  ];
+  vendorHash = "sha256-uULJKg1nh6jU0uIgDf4GMu8O00zifLvU2wv65dlHLAs=";
+  postInstallPhase = ''
+    mv $out/bin/server $out/bin/juicity-server
+    mv $out/bin/client $out/bin/juicity-client
+  '';
+
+  ldflags = [
+    "-s"
+    "-w"
+    "-X"
+    "github.com/juicity/juicity/config.Version=${version}"
+  ];
+}