fixup! drop debug changes, pin sccache on x64 linux

Author: aduh95

tools/nix/pkgs.nix

@@ -15,6 +15,7 @@ if builtins.currentSystem == "x86_64-darwin" then
 else
   nixpkgs
   // nixpkgs.lib.optionalAttrs (with nixpkgs.stdenv.hostPlatform; isLinux && isx86_64) {
+    # TODO: remove pin once https://github.com/mozilla/sccache/issues/2869 is resolved
     sccache = nixpkgs.callPackage (builtins.fetchurl {
       url = "${repo}/raw/aff8a0b28396750446e5537a96461bc4facdb287/pkgs/by-name/sc/sccache/package.nix";
       sha256 = "09dlc99sam9ld9jvzgcc00r4v4ls1cmbb0yim3mr895fpbs8b3qa";