github项目：https://github.com/gurinatto/enem-do-bem-site
没什么多说的，尝试部署站点，但我一直遇到错误。不知道纱线，我的代码或其他问题是否存在。
错误日志：https://pastebin.com/SQic2kTT
7:14:28 PM: $ yarn run build
7:14:28 PM: bash: yarn: command not found
7:14:28 PM:
7:14:28 PM: ┌─────────────────────────────┐
7:14:28 PM: │ "build.command" failed │
7:14:28 PM: └─────────────────────────────┘
7:14:28 PM:
7:14:28 PM: Error message
7:14:28 PM: Command failed with exit code 127: yarn run build
7:14:28 PM:
7:14:28 PM: Error location
7:14:28 PM: In Build command from Netlify app:
7:14:28 PM: yarn run build
7:14:28 PM:
7:14:28 PM: Resolved config
7:14:28 PM: build:
7:14:28 PM: command: yarn run build
7:14:28 PM: commandOrigin: ui
7:14:28 PM: publish: /opt/build/repo/build
7:14:28 PM: Caching artifacts
7:14:28 PM: Started saving node modules
7:14:28 PM: Finished saving node modules
7:14:28 PM: Started saving build plugins
7:14:28 PM: Finished saving build plugins
7:14:28 PM: Started saving pip cache
7:14:28 PM: Finished saving pip cache
7:14:28 PM: Started saving emacs cask dependencies
7:14:28 PM: Finished saving emacs cask dependencies
7:14:28 PM: Started saving maven dependencies
7:14:28 PM: Finished saving maven dependencies
7:14:28 PM: Started saving boot dependencies
7:14:28 PM: Finished saving boot dependencies
7:14:28 PM: Started saving go dependencies
7:14:28 PM: Finished saving go dependencies
7:14:31 PM: Error running command: Build script returned non-zero exit code: 1
7:14:31 PM: Failing build: Failed to build site
7:14:31 PM: Failed during stage 'building site': Build script returned non-zero exit code: 1
7:14:31 PM: Finished processing build request in 1m0.62316905s