Merge pull request #2138 from murgatroid99/xds_interop_tag_branch_images

xDS k8s interop script: publish version-tagged docker images

packages/grpc-js-xds/scripts/xds_k8s_lb.sh

@@ -45,6 +45,10 @@ build_test_app_docker_images() {
     -t "${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
     .
 
+  if is_version_branch "${TESTING_VERSION}"; then
+    tag_and_push_docker_image "${CLIENT_IMAGE_NAME}" "${GIT_COMMIT}" "${TESTING_VERSION}"
+  fi
+
   popd
 
   gcloud -q auth configure-docker
@@ -106,7 +110,7 @@ run_test() {
     --secondary_kube_context="${SECONDARY_KUBE_CONTEXT}" \
     --client_image="${CLIENT_IMAGE_NAME}:${GIT_COMMIT}" \
     --server_image="${SERVER_IMAGE_NAME}" \
-    --testing_version=$(echo "$KOKORO_JOB_NAME" | sed -E 's|^grpc/node/([^/]+)/.*|\1|') \
+    --testing_version="${TESTING_VERSION}" \
     --xml_output_file="${TEST_XML_OUTPUT_DIR}/${test_name}/sponge_log.xml"
 }