Dockerfile: improve build speed and image size

[FrancoisCapon]

Hello,

Thanks for your feedback on my previous PR on Dockerfile.

Here's another one :

• that uses uv to speed up "pip installs" (total gain of ~30%)

@home
docker system prune -f && build with no cache:
[+] Building 33.1s (22/22) FINISHED 
[+] Building 51.6s (15/15) FINISHED

@github action
#7767 Build Docker image 40s
#7675 Build Docker image 57s

• that go below the 150MB size for the image

Total Image size: 149 MB         
Potential wasted space: 0 B
Image efficiency score: 100 % 

Perhaps, you know the documentation framework used 😉
https://docs.astral.sh/uv/

By the way, no feedback on my idea of setting palettes for pages and sections?

[squidfunk]

Thanks for the PR. However, we're not considering merging this right now. The reason is that we currently do not want to introduce any new dependencies, because we're working from first principles in the background, hence we have a feature freeze. I understand this is an optimization, but it bears the risk of more maintenance down the road.

I hope for your understanding. Thanks!