Sometimes your Docker image isn't bloated, but #HEP just has some pretty big binaries in our simulation stack.
For a similar public Docker image, here's the dive analysis of https://github.com/matthewfeickert/pythia-python
GitHub - matthewfeickert/pythia-python: Pythia 8 Docker image with Python 3 and the HEP simulation stack

Pythia 8 Docker image with Python 3 and the HEP simulation stack - GitHub - matthewfeickert/pythia-python: Pythia 8 Docker image with Python 3 and the HEP simulation stack

GitHub
Building these images to do my physics reminds me of Ricardo Rocha's nice #Kubecon2022 Keynote "A Cloud Native Swiss Knife" https://youtu.be/csL6zY-IEOI
Keynote: A Cloud Native Swiss Knife - Ricardo Rocha, Computing Engineer, CERN

YouTube
@matthewfeickert I've added this to my watch list!