message: [CODEOWNERS] add CI configs to list
  Closes:
diff: +# Substribe to CI changes
  +/.circleci/ @libra/libra-oss-admin-team
  +/.github/ @libra/libra-oss-admin-team
  # Subscribe to crypto crate changing PRs
  /crypto @kchalkias @huitseeker @valerini
  # Subscribe to potential JSON API changing PRs
  