Fix Bazel build by using a newer Ubuntu image which will install newer clang versions by default.

PiperOrigin-RevId: 750215059

Author: hanyangtay

.kokoro/gcp_ubuntu/kokoro_build.sh

@@ -22,9 +22,9 @@ set -eu
 # in the job configuration.
 cd "${KOKORO_ARTIFACTS_DIR}/github/silifuzz/.kokoro/gcp_ubuntu"
 
-# Pin Debian Docker image to bookworm for better hermeticity.
+# Pin Ubuntu Docker image to noble for updated clang and better hermeticity.
 # See https://github.com/google/silifuzz/issues/9.
-DOCKER_IMAGE=debian:bookworm
+DOCKER_IMAGE=ubuntu:noble
 
 docker run \
   --security-opt seccomp=unconfined \

install_build_dependencies.sh

@@ -13,12 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Tested on Debian GNU/Linux 11 (bullseye)
+# Tested on Ubuntu 24.04 (Noble Numbat).
 #
 # * git: to get the SiliFuzz sources.
 # * bazel, clang, lld, python: to build SiliFuzz
 # * libssl-dev: silifuzz uses SHA1.
-#   Clang 11 or newer will work.
+#   Clang 18 or newer will work.
 #   To get all of the functionality you may need to install fresh clang from
 #   source: https://llvm.org/.
 
@@ -36,4 +36,8 @@ echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" \
 apt update
 
 # Install dependencies.
-apt install --no-install-recommends -y git bazel bazel-7.4.1 libssl-dev libzstd-dev clang libclang-rt-dev lld python3 libpython3-stdlib
+# `DEBIAN_FRONTEND=noninteractive` avoids interactive prompts that interrupt the
+# script while installing a transitive dependency: `tzdata`.
+# Note that this is a debconf-specific env var that is required by both Debian
+# and Ubuntu.
+DEBIAN_FRONTEND=noninteractive apt install --no-install-recommends -y git bazel bazel-7.4.1 libssl-dev libzstd-dev clang libclang-rt-dev lld python3 libpython3-stdlib