message: size-diff CI step: make sure the toolchains for the old and new commits are both installed, otherwise the old commit will fail to build.
diff: @@ -44,6 +44,7 @@ jobs:
  git remote set-branches "${UPSTREAM_REMOTE_NAME}" "${GITHUB_BASE_REF}"
  git fetch --depth=1 "${UPSTREAM_REMOTE_NAME}" "${GITHUB_BASE_REF}"
  git checkout "${UPSTREAM_REMOTE_NAME}/${GITHUB_BASE_REF}"
  + rustup target add riscv32imc-unknown-none-elf thumbv7em-none-eabi
  make -j2 examples
  cargo run --release -p print_sizes >'${{runner.temp}}/base-sizes'
  