polkadot: build only main node binary (#366617)

Author: andresilva

pkgs/applications/blockchains/polkadot/default.nix

@@ -60,15 +60,7 @@ rustPlatform.buildRustPackage rec {
   };
 
   buildType = "production";
-
-  cargoBuildFlags = [
-    "-p"
-    "polkadot"
-    "-p"
-    "polkadot-omni-node"
-    "-p"
-    "polkadot-parachain-bin"
-  ];
+  buildAndTestSubdir = "polkadot";
 
   # NOTE: tests currently fail to compile due to an issue with cargo-auditable
   # and resolution of features flags, potentially related to this:
@@ -100,8 +92,8 @@ rustPlatform.buildRustPackage rec {
   ROCKSDB_LIB_DIR = "${rocksdb}/lib";
 
   meta = with lib; {
-    description = "Polkadot Node Implementation";
-    homepage = "https://polkadot.network";
+    description = "Implementation of a https://polkadot.network node in Rust based on the Substrate framework";
+    homepage = "https://github.com/paritytech/polkadot-sdk";
     license = licenses.gpl3Only;
     maintainers = with maintainers; [
       akru