message: ci: cleanup clang.bazelrc after CI container runs.
  When invoked locally, this avoids interference with --config=libc++.
diff: @@ -70,6 +70,15 @@ if [[ -f "/etc/redhat-release" ]]; then
  export BAZEL_BUILD_EXTRA_OPTIONS+="--copt=-DENVOY_IGNORE_GLIBCXX_USE_CXX11_ABI_ERROR=1"
  fi
  +function cleanup() {
  + # Remove build artifacts. This doesn't mess with incremental builds as these
  + # are just symlinks.
  + rm -rf "${ENVOY_SRCDIR}"/bazel-* clang.bazelrc
  +}
  +
  +cleanup
  +trap cleanup EXIT
  +
  bazel/setup_clang.sh /opt/llvm
  [[ "${BUILD_REASON}" != "PullRequest" ]] && BAZEL_EXTRA_TEST_OPTIONS+=" --nocache_test_results --test_output=all"
  @@ -116,15 +125,6 @@ mkdir -p "${ENVOY_FAILED_TEST_LOGS}"
  export ENVOY_BUILD_PROFILE="${ENVOY_BUILD_DIR}"/generated/build-profile
  mkdir -p "${ENVOY_BUILD_PROFILE}"
  -function cleanup() {
  - # Remove build artifacts. This doesn't mess with incremental builds as these
  - # are just symlinks.
  - rm -rf "${ENVOY_SRCDIR}"/bazel-*
  -}
  -
  -cleanup
  -trap cleanup EXIT
  -
  mkdir -p "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/bazel
  ln -sf "${ENVOY_SRCDIR}"/bazel/get_workspace_status "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/bazel/
  cp -f "${ENVOY_SRCDIR}"/.bazelrc "${ENVOY_FILTER_EXAMPLE_SRCDIR}"/
  