### What this PR does / why we need it?
[CI] Update doctest from 0.9.1 to 0.13.0, and copy doc test workflow to
nightly CI for better monitor.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.14.1
- vLLM main:
dc917cceb8
---------
Signed-off-by: menogrey <1299267905@qq.com>
Add `releases` match case for CI jobs and update related doc for v0.13.0
branch
- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef
Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>