zombinet require plain spec for the relay

Author: librelois

test/configs/zombieAlphanet.json

@@ -5,6 +5,7 @@
   },
   "relaychain": {
     "chain": "rococo-local",
+    "chain_spec_path": "tmp/rococo-modified-spec.json",
     "default_command": "tmp/polkadot",
     "default_args": [
       "--no-hardware-benchmarks",

test/scripts/download-polkadot.sh

@@ -43,4 +43,3 @@ fi
 # TODO remove that when rococo local will enable async backing by default (probably polkadot v1.7)
 tmp/polkadot build-spec --chain rococo-local > tmp/rococo-plain-spec.json
 pnpm tsx scripts/modify-rococo-plain-specs.ts process tmp/rococo-plain-spec.json tmp/rococo-modified-spec.json
-tmp/polkadot build-spec --chain tmp/rococo-modified-spec.json --raw > tmp/rococo-raw-spec.json