kokoro: use lightweight license-checker image (#143)

BUG=393622588

kokoro/license-check/build.sh

@@ -20,8 +20,6 @@ SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
 ROOT_DIR="$( cd "${SCRIPT_DIR}/../.." >/dev/null 2>&1 && pwd )"
 
 docker run --rm -i \
-  --volume "${ROOT_DIR}:${ROOT_DIR}" \
-  --volume "${KOKORO_ARTIFACTS_DIR}:/mnt/artifacts" \
+  --volume "${ROOT_DIR}:${ROOT_DIR}:ro" \
   --workdir "${ROOT_DIR}" \
-  --entrypoint "${SCRIPT_DIR}/presubmit-docker.sh" \
-  "gcr.io/shaderc-build/radial-build:latest"
+  us-east4-docker.pkg.dev/shaderc-build/radial-docker/ubuntu-24.04-amd64/license-checker

kokoro/license-check/presubmit-docker.sh

@@ -1,19 +0,0 @@
-#!/bin/bash
-
-# Copyright 2020 The Marl 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
-#
-#     https://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 -e # Fail on any error.
-
-license-checker

kokoro/license-check/presubmit.cfg

@@ -1,4 +1,4 @@
 # Format: //devtools/kokoro/config/proto/build.proto
 
-build_file: "cppdap/kokoro/license-check/presubmit.sh"
+build_file: "cppdap/kokoro/license-check/build.sh"