build: Revert naersk, restore rustPlatform for cross-compilation (#43)

Naersk was introduced as an experiment for Nix build caching but doesn't
handle cross-builds well, which we need for the release workflow.
Reverts to nixpkgs' `rustPlatform.buildRustPackage` and bumps to 0.8.5.

Author: tembleking

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "sysdig-lsp"
-version = "0.8.4"
+version = "0.8.5"
 edition = "2024"
 authors = [ "Sysdig Inc." ]
 readme = "README.md"

Cargo.toml

@@ -2,19 +2,16 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
     flake-utils.url = "github:numtide/flake-utils";
-    naersk.url = "github:nix-community/naersk"; # Allows rust build caching
   };
   outputs =
     {
       self,
       nixpkgs,
       flake-utils,
-      naersk,
     }:
     let
       overlays.default = final: prev: {
         sysdig-lsp = prev.callPackage ./package.nix { };
-        naersk = prev.callPackage naersk { };
       };
 
       flake = flake-utils.lib.eachDefaultSystem (

flake.lock

@@ -1,5 +1,5 @@
 {
-  naersk,
+  rustPlatform,
   pkgsStatic,
   lib,
   stdenv,
@@ -9,10 +9,13 @@
 let
   cargoFile = builtins.fromTOML (builtins.readFile ./Cargo.toml);
 in
-naersk.buildPackage {
+rustPlatform.buildRustPackage {
   pname = cargoFile.package.name;
   version = cargoFile.package.version;
   src = ./.;
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
 
   nativeBuildInputs = [
     pkg-config