There probably are such scripts, but the educational value is bigger in the post format. That said, if you do such things at scale, you'll likely have automate

There probably are such scripts, but the educational value is bigger in the post format. That said, if you do such things at scale, you'll likely have automated provisioning and configuration management systems in place anyway. For example you could have images that have the static parts already pre-configured, and something like cloudinit for the ssh keys and/or passwords. Or you provision the systems with foreman, and then use puppet for configuration management.