[fivea]

> If I build an image using the Dockerfile in the blog post 10 days later (...)

To start off, if you intend to run the same container image for 10 days straight, you have far more pressing problems than reproducibility.

Personally I know of zero professional projects whose production CICD pipeline don't deploy multiple times per day, or in the very worst case weekly in very rare cases where there is zero commit.

> OP's suggestion is to build a separate image with required packages, tag it with something like "mybaseimage:25032022" and use it as my base image in the Dockerfile.

Again, that adds absolutely nothing to just pulling the latest base image, running apt-get upgrade, and tagging/adding metadata.