[docker] added rdma support

[FrankLeeeee]

Motivation

The existing Docker does not support RDMA, which makes it insufficient to run cross-node servers such as DeepSeek V3. This PR added the support for RDMA with testing and documentation.

Modifications

Installed RDMA libs in docker and adjusted the necessary docker flags. I conducted several tests to verify the usage of RDMA and all tests passed.

1. Single-node IB write

2. Two-node IB write

3. Single-node pytorch all reduce

4. Two-node pytorch all reduce

Checklist

• Format your code according to the Code Formatting with Pre-Commit.
• Add unit tests as outlined in the Running Unit Tests.
• Update documentation / docstrings / example tutorials as needed, according to Writing Documentation.
• Provide throughput / latency benchmark results and accuracy evaluation results as needed, according to Benchmark and Profiling and Accuracy Results.
• For reviewers: If you haven't made any contributions to this PR and are only assisting with merging the main branch, please remove yourself as a co-author when merging the PR.
• Please feel free to join our Slack channel at https://slack.sglang.ai to discuss your PR.

[FrankLeeeee]

cc @zhaochenyang20 @zhyncs

[zhaochenyang20]

@FrankLeeeee Thanks!

[zhyncs]

Thanks!