### What this PR does / why we need it?
Add basic CI for PD disaggregation, and enable it when schedule and
label with `module:pd`
- Updated `.github/actionlint.yaml` to add a new self-hosted runner
configuration: `linux-arm64-npu-static-8`.
- Introduced a new GitHub Actions workflow
`.github/workflows/vllm_ascend_test_pd.yaml` for PD disaggregation
testing:
- Scheduled to run daily at 23:00 UTC and triggered by pull request
label `module:pd`.
- Added steps for baisci installation and other steps will add in
followup PR
Related: https://github.com/vllm-project/vllm-ascend/issues/841
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
- CI passed
- No trigger by default
<img width="847" alt="image"
src="https://github.com/user-attachments/assets/23aa128f-526d-447f-91c8-8ebf6be8400f"
/>
- Trigger only if we tag with pd
<img width="930" alt="image"
src="https://github.com/user-attachments/assets/aef1caca-2029-48e8-a6e6-860136adcd37"
/>
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
