[Doc] Update tip info on using latest transformers when creating a custom Dockerfile

[MarcCote]

This PR updates the following tip info under the Use vLLM’s Official Docker Image section of the docs.

There is no need for --system when updating the Python installation is already managed by uv (according to this astral-sh/uv#12204 (comment)).

When running with --system I was getting this error:

[+] Building 7.8s (5/6)                                                                                                                                                                                                        docker:default
 => [internal] load build definition from dockerfile                                                                                                                                                                                     0.4s
 => => transferring dockerfile: 215B                                                                                                                                                                                                     0.0s
 => [internal] load metadata for docker.io/vllm/vllm-openai:v0.8.0                                                                                                                                                                       0.0s 
 => [internal] load .dockerignore                                                                                                                                                                                                        0.3s 
 => => transferring context: 2B                                                                                                                                                                                                          0.0s 
 => [1/3] FROM docker.io/vllm/vllm-openai:v0.8.0                                                                                                                                                                                         4.7s 
 => ERROR [2/3] RUN uv pip install --system git+https://github.com/huggingface/transformers.git                                                                                                                                          1.5s 
------                                                                                                                                                                                                                                        
 > [2/3] RUN uv pip install --system git+https://github.com/huggingface/transformers.git:                                                                                                                                                     
1.230 error: No system Python installation found                                                                                                                                                                                              
------                                                                                                                                                                                                                                        
dockerfile:3                                                                                                                                                                                                                                  
--------------------                                                                                                                                                                                                                          
   1 |     FROM vllm/vllm-openai:v0.8.0                                                                                                                                                                                                       
   2 |                                                                                                                                                                                                                                        
   3 | >>> RUN uv pip install --system git+https://github.com/huggingface/transformers.git

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[DarkLight1337]

Thanks for fixing! Can you update the other example dockerfile as well?

[MarcCote]

Thanks for fixing! Can you update the other example dockerfile as well?

You are talking about this example?

FROM vllm/vllm-openai:v0.7.3

# e.g. install the `audio` and `video` optional dependencies
# NOTE: Make sure the version of vLLM matches the base image!
RUN uv pip install --system vllm[audio,video]==0.7.3

If so, I believe in vllm/vllm-openai:v0.7.3 the Python installation is not managed by uv, that's why it needs --system. That change happened ~2 weeks in #13569

Edit: let me know if you want me to change v0.7.3 for v0.8.0 in that example, instead.

[MarcCote]

Actually, I went ahead and made the version change. That seems like the right thing to do, anyway. I have tested both examples locally and they worked for me.

[DarkLight1337]

Sounds good to me, thanks!

[nickhelion]

I tried the sample without --system below

FROM vllm/vllm-openai:latest

RUN uv pip install vllm[audio,video]

and it gives

> ERROR [2/2] RUN uv pip install vllm[audio,video]                                                                                   0.3s 
------
 > [2/2] RUN uv pip install vllm[audio,video]:
0.330 error: No virtual environment found; run `uv venv` to create an environment, or pass `--system` to install into a non-virtual environment
------
--------------------
   1 |     FROM vllm/vllm-openai:latest
   2 |
   3 | >>> RUN uv pip install vllm[audio,video]
   4 |
--------------------
ERROR: failed to solve: process "/bin/sh -c uv pip install vllm[audio,video]" did not complete successfully: exit code: 2

putting it back solved the issue.
Maybe the vllm/vllm:latest i pulled today is not actually the latest?

[DarkLight1337]

--system is now needed again because #13569 got reverted due to breaking a bunch of deployments

[DarkLight1337]

The docs have been updated in #15616