To put it simply, it means saving a copy of the local disk image with the container environment enabled, and then dd it to the vps

Could you please provide a step-by-step explanation on how to "then package it and dd on the VPS"?

Thank you!

Run a CHR in the local virtualization environment and enable the container, then package it and dd on the vps.
This is a proven and workable solution.
The most important thing is that this method is suitable for almost all cloud servers !!
If necessary contact me