[CI] Exclude diffusion-specific paths from main_package filter

[LLThomas]

Motivation

Closes #21990

When a Diffusion PR modifies files under python/sglang/jit_kernel/diffusion/, python/sglang/jit_kernel/tests/diffusion/, python/sglang/jit_kernel/benchmark/diffusion/, or python/sglang/cli/, it incorrectly triggers LLM CI jobs (stage-a, stage-b, etc.). This is because the main_package path filter in pr-test.yml only excluded multimodal_gen, so changes to these diffusion-specific paths matched the python/sglang/!(multimodal_gen)/** glob and set main_package=true.

Modifications

Modified .github/workflows/pr-test.yml in two places:

1. paths-filter glob (line 130)

Before:
python/sglang/!(multimodal_gen)/**/!(*.md)

After:
python/sglang/!(multimodal_gen|jit_kernel/diffusion|jit_kernel/tests/diffusion|jit_kernel/benchmark/diffusion|cli)/**/!(*.md)

Extended the negation pattern to also exclude jit_kernel/diffusion, jit_kernel/tests/diffusion, jit_kernel/benchmark/diffusion, and cli from the main_package filter.

2. API-based fallback grep filter (line 192)

Before:
grep -v "^python/sglang/multimodal_gen/"

After:
grep -v -E "^(python/sglang/multimodal_gen/|python/sglang/jit_kernel/diffusion/|python/sglang/jit_kernel/tests/diffusion/|python/sglang/jit_kernel/benchmark/diffusion/|python/sglang/cli/)"

The API-based change detection (used for workflow_dispatch with target_stage) had the same gap — it only excluded multimodal_gen/. Extended the grep -v filter to exclude all diffusion-specific paths.

Note: these paths are already covered by the multimodal_gen filter (lines 139-142), so Diffusion PRs will still correctly trigger the multimodal_gen CI jobs.

Accuracy Tests

N/A

Speed Tests and Profiling

N/A

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review and Merge Process

1. Ping Merge Oncalls to start the process. See the PR Merge Process.
2. Get approvals from CODEOWNERS and other reviewers.
3. Trigger CI tests with comments or contact authorized users to do so.
   • Common commands include /tag-and-rerun-ci, /tag-run-ci-label, /rerun-failed-ci
4. After green CI and required approvals, ask Merge Oncalls or people with Write permission to merge the PR.

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[LLThomas]

Hi @ping1jing2 , plz take a look at this when you have free time.

[Makcum888e]

LGTM

[ping1jing2]

/tag-and-rerun-ci

[mickqian]

the problem persists: https://github.com/sgl-project/sglang/actions/runs/24627840303/job/72547448794?pr=23053