fix(pm/bluesky): genericize build

Bluesky PDS was trying to remove a specific version of atproto. This
meant that as the version was bumped, the build would break. If we use
find to check the right version to remove, this won't break anymore
unless the build does actually need to change

packetmix/packages/bluesky-pds/default.nix

···
       }:
       config.inputs.nixos-unstable.result.${system}.bluesky-pds.overrideAttrs {
         postBuild = ''
-          rm -r node_modules/.pnpm/@atproto+pds@0.4.169
-          mkdir -p node_modules/.pnpm/@atproto+pds@0.4.169
+          atproto_pds_dir=$(${pkgs.findutils}/bin/find node_modules/.pnpm -maxdepth 1 -name "@atproto+pds@*")
+          rm -r $atproto_pds_dir
+          mkdir -p $atproto_pds_dir
           ln -s ${
             config.packages.bluesky-atproto-pds.result.${system}
-          }/lib node_modules/.pnpm/@atproto+pds@0.4.169/node_modules
+          }/lib $atproto_pds_dir/node_modules
         '';
       };
   };