reuse bits from the dockerfiles used in Jenkins containerized builds

It would be nice for this image to reuse bits from https://github.com/nodejs/build/tree/main/ansible/roles/docker/templates , or if the containers used in the Jenkins CI can be based on nightly images from dockerhub published from here, and then only apply edits from a PR to incrementally build it. That might speed up containerized builds considerably.

This would require changing the docker container layout (e.g. user should be iojs instead)

cc @nodejs/build @nodejs/devcontainer

首先检查 ansible/roles/docker/templates 中的 Docker 模板，并将其与此仓库的容器布局以及容器化的 Jenkins 构建进行比较。确定预期使用的是 Docker Hub 的 nightly 镜像还是共享模板片段，包括提议的 iojs 用户变更。完成的标准是：构建布局和复用方式已达成一致，并且能够明确证明容器化的 Jenkins 构建速度更快。