Revert "Revert "Temporarily disable protoc-plugin in CI"" (grpc#1451)

* Revert "Revert "Temporarily disable protoc-plugin in CI (grpc#1447)" (grpc#1448)"

This reverts commit e6909cd.

* Update run_basic_tests.sh

scripts/run_basic_tests.sh

@@ -68,7 +68,13 @@ docker-compose down
 echo -e "\n[Running] Basic test #3 - Testing everything buids"
 if [[ "$MASTER" == "1" ]]; then
   # Build all for continuous_integration
-  docker-compose build
+  # docker-compose build
+
+  # Temporary fix `protoc-plugin` build failure (introduced in
+  # https://github.com/grpc/grpc-web/pull/1445) by building
+  # everything but it.
+  # TODO: Revert to building all targets.
+  docker-compose build prereqs echo-server node-server node-interop-server envoy grpcwebproxy commonjs-client closure-client ts-client binary-client interop-client jsunit-test
 else
   # Only build a subset of docker images for presubmit runs
   docker-compose build commonjs-client closure-client ts-client