query-node: test runner set correct ws endpoint

query-node/run-tests.sh

@@ -16,6 +16,10 @@ function cleanup() {
 
 trap cleanup EXIT
 
+# The endpoint name comes from the expected container name for joystream/node
+# in tests/network-tests/run-tests.sh
+WS_PROVIDER_ENDPOINT_URI=ws://joystream-node:9944/
+
 yarn build
 yarn db:up
 yarn db:migrate