chore: update Dockerfile to reduce the image size

[tdurieux]

Hi there,

I've made a small improvement to the Dockerfile that I think could help optimize the image size.

The change I made:

• I added the --no-cache-dir to the pip command to disable the package cache.

Impact on the image size:

• Image size before repair: 289.16 MB
• Image size after repair: 258.51 MB
• Difference: 30.65 MB (10.6%)

I hope that you will find these changes useful to you. Let me know if you have any questions or concerns.

Thanks!