Docker部署Rails：开发环境正常，预发布环境启动失败求助

• 开发环境：Ubuntu LTS 22.04、Docker、Rails 7.1、Puma v6.4.2，运行完全正常
• 预发布环境：使用与开发环境同版本的Ubuntu、Docker、Rails、Puma，新增Apache服务，启动失败

报错信息如下：

Puma starting in single mode...
* Puma version: 6.4.2 (ruby 3.2.4-p170) ("The Eagle of Durango")
*  Min threads: 5
*  Max threads: 5
*  Environment: staging
*          PID: 132
! Unable to load application: NameError: uninitialized constant CalsShibGem::Lib::CalsShib
bundler: failed to load command: puma (/usr/local/bundle/bin/puma)
/usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/eager_load.rb:180:in `const_get': uninitialized constant CalsShibGem::Lib::CalsShib (NameError)

            queue << [abspath, namespace.const_get(cname, false)]
                                        ^^^^^^^^^^
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/eager_load.rb:180:in `block in actual_eager_load_dir'
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/helpers.rb:47:in `block in ls'
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/helpers.rb:25:in `each'
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/helpers.rb:25:in `ls'
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/eager_load.rb:168:in `actual_eager_load_dir'
    from /usr/local/bundle/gems/zeitwerk-2.6.16/lib/zeitwerk/loader/eager_load.rb:17:in `block (2 levels) in eager_load'

CalsShibGem是存放在Rails应用/lib/目录下的自定义gem，我已准备好Gemfile、config/puma.rb、Dockerfile.staging、docker-compose.staging.yml、docker_entrypoint_staging.sh等相关配置文件，请问有没有人遇到过类似问题？

感谢帮助！

内容的提问来源于stack exchange，提问作者Chris