CircleCI+Rails7执行assets:precompile报错‘yarn:not found’

之前使用CircleCI运行Rails项目的RSpec测试一切正常，直到添加视图相关测试后，测试失败并报错：

ActionView::Template::Error:
The asset "application.css" is not present in the asset pipeline.

判断是资产未预编译导致的问题，于是在项目的config.yml中做了两处修改：

• 引入cimg/node:19.2.0镜像，用于提供yarn运行环境
• 添加bundle exec rails assets:precompile命令执行资产预编译

但执行构建时出现新错误，提示yarn: not found，完整错误日志如下：

#!/bin/bash -eo pipefail
bundle exec rake assets:precompile
sh: 1: yarn: not found
rake aborted!
jsbundling-rails: Command build failed, ensure yarn is installed and `yarn build` runs without errors
/home/circleci/my_project/vendor/bundle/ruby/3.1.0/gems/jsbundling-rails-1.0.3/lib/tasks/jsbundling/build.rake:5:in `block (2 levels) in <main>'
/home/circleci/my_project/vendor/bundle/ruby/3.1.0/gems/rake-13.0.6/exe/rake:27:in `<top (required)>'
/home/circleci/.rubygems/bin/bundle:25:in `load'
/home/circleci/.rubygems/bin/bundle:25:in `<main>'
Tasks: TOP => assets:precompile => javascript:build
(See full trace by running task with --trace)

Exited with code exit status 1
CircleCI received exit code 1

根据镜像官方信息，cimg/node:19.2.0应该默认包含yarn，但实际构建过程中却找不到该命令。config.yml里第22行配置了这个node镜像，第53-55行添加了资产预编译的命令。

内容的提问来源于stack exchange，提问作者John