kokoro: linux: use cpp-builder instead of radial-build (#1089)

Bug: crbug.com/391948942

Author: dneto0

kokoro/scripts/linux/build.sh

@@ -36,6 +36,6 @@ docker run --rm -i \
   --env EXTRA_CONFIG="${EXTRA_CONFIG}" \
   --env KOKORO_ARTIFACTS_DIR="${KOKORO_ARTIFACTS_DIR}" \
   --entrypoint "${SCRIPT_DIR}/build-docker.sh" \
-  "gcr.io/shaderc-build/radial-build:latest"
+  us-east4-docker.pkg.dev/shaderc-build/radial-docker/ubuntu-24.04-amd64/cpp-builder
 
 sudo chown -R "$(id -u):$(id -g)" "${ROOT_DIR}/build"

kokoro/scripts/linux/build_dawn.sh

@@ -36,6 +36,6 @@ docker run --rm -i \
   --env EXTRA_CONFIG="${EXTRA_CONFIG}" \
   --env KOKORO_ARTIFACTS_DIR="${KOKORO_ARTIFACTS_DIR}" \
   --entrypoint "${SCRIPT_DIR}/build_dawn-docker.sh" \
-  "gcr.io/shaderc-build/radial-build:latest"
+  us-east4-docker.pkg.dev/shaderc-build/radial-docker/ubuntu-24.04-amd64/cpp-builder
 
 sudo chown -R "$(id -u):$(id -g)" "${ROOT_DIR}/build"