ADD: added new version of protobuf

libs/protobuf/kokoro/linux/bazel/build.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+#
+# Build file to set up and run tests
+set -ex
+
+# Install Bazel 4.0.0.
+use_bazel.sh 4.0.0
+bazel version
+
+# Print bazel testlogs to stdout when tests failed.
+function print_test_logs {
+  # TODO(yannic): Only print logs of failing tests.
+  testlogs_dir=$(bazel info bazel-testlogs)
+  testlogs=$(find "${testlogs_dir}" -name "*.log")
+  for log in $testlogs; do
+    cat "${log}"
+  done
+}
+
+# Change to repo root
+cd $(dirname $0)/../../..
+
+git submodule update --init --recursive
+
+#  Disabled for now, re-enable if appropriate.
+#  //:build_files_updated_unittest \
+
+trap print_test_logs EXIT
+bazel test -k --copt=-Werror --host_copt=-Werror \
+  //build_defs:all \
+  //java:tests \
+  //:protoc \
+  //:protobuf \
+  //:protobuf_python \
+  //:protobuf_test
+trap - EXIT
+
+pushd examples
+bazel build //...
+popd
+
+# Verify that we can build successfully from generated tar files.
+./autogen.sh && ./configure && make -j$(nproc) dist
+DIST=`ls *.tar.gz`
+tar -xf $DIST
+cd ${DIST//.tar.gz}
+bazel build //:protobuf //:protobuf_java