add job to give early warning about incompatible bazel changes

tools/internal_ci/linux/grpc_bazel_rbe_incompatible_changes.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# Copyright 2017 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -ex
+
+# TODO(jtattermusch): use the latest version of bazel
+
+# Use --all_incompatible_changes to give an early warning about future
+# bazel incompatibilities.
+EXTRA_FLAGS="--config=opt --cache_test_results=no --all_incompatible_changes"
+github/grpc/tools/internal_ci/linux/grpc_bazel_on_foundry_base.sh "${EXTRA_FLAGS}"