message: [ci] Notify on TCB summary changes
diff: /client/libra-dev/ @thefallentree @xli
  # Subscribe to LCS format changes
  /testsuite/generate-format/tests/staged/libra.yaml @thefallentree @matbd @xli
  +# Subscribe to TCB dependency summary changes
  +/summaries/summary-lsr.toml @davidiw
  +/summaries/summary-lec.toml @davidiw
  