fix (hook-create-chronics: fix build issue with nix due to missing nlohmann/json pkg

Signed-off-by: Ritesh.K <[email protected]>

Author: RiteshKarki27

packaging/nix/villas.nix

@@ -48,6 +48,7 @@
   pkg-config,
   stdenv,
   system,
+  nlohmann_json,
   bzip2,
   # Optional dependencies
   boxfort,
@@ -152,6 +153,7 @@ stdenv.mkDerivation {
     curl
     spdlog
     bash
+    nlohmann_json
     bzip2
   ]
   ++ lib.optionals withExtraTesting [