Add `checkout` action before `dorny/paths-filter` to make it works with
`push` case.
This is a known issue that `dorny/paths-filter` works without `checkout`
in `pull_request` case but failed in `push` case. More detail is here:
https://github.com/dorny/paths-filter/issues/60#issuecomment-1464281021
The push CI works after this PR. The test result is here:
https://github.com/wangxiyuan/vllm-ascend/actions/runs/16285606468/job/45983607539
- vLLM version: v0.9.2
- vLLM main:
d4d309409f
Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>