CI: don't instruct the user to do npm run format (#267)

.github/workflows/checkin.yml

@@ -31,6 +31,6 @@ jobs:
  # Ensure no changes, but ignore node_modules dir since dev/fresh ci deps installed.
  run: |
  git diff --exit-code --stat -- . ':!node_modules' \
- || (echo "##[error] found changed files after build. please 'npm run build && npm run format'" \
+ || (echo "##[error] found changed files after build. please 'npm ci && npm run build'" \
  "and check in all changes" \
  && exit 1)