[libc++] Install clang-format on CI nodes

Author: ldionne

libcxx/utils/ci/Dockerfile

@@ -45,7 +45,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y bash curl
 
 # Install various tools used by the build or the test suite
-RUN apt-get update && apt-get install -y ninja-build python3 python3-sphinx python3-distutils git gdb
+RUN apt-get update && apt-get install -y ninja-build python3 python3-sphinx python3-distutils git gdb clang-format
 RUN apt-get update && apt-get install -y libc6-dev-i386 # Required to cross-compile to 32 bits
 
 # Install the most recently released LLVM

libcxx/utils/ci/macos-ci-setup

@@ -10,7 +10,7 @@ source secrets.env
 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
 
 # Install the required tools to run CI
-brew install sphinx-doc python3 ninja cmake buildkite/buildkite/buildkite-agent
+brew install sphinx-doc python3 ninja cmake clang-format buildkite/buildkite/buildkite-agent
 
 CFG_DIR="$(brew --prefix)/etc/buildkite-agent"