[CI] support nightly ci for per pr by labels (#6483)

### What this PR does / why we need it?

This PR refactors the nightly CI workflows (A2 and A3) to support
running tests against a specific PR's code, in addition to the existing
scheduled/dispatch runs using pre-built images.

#### Motivation:
Previously, nightly tests could only be triggered by schedule or
workflow_dispatch, always using the pre-built nightly image. This change
allows developers to trigger nightly tests against their own PR's source
code, enabling early validation without waiting for a nightly build.

#### Changes
Trigger logic (parse-trigger job)

A new parse-trigger job is introduced in both
schedule_nightly_test_a2.yaml and schedule_nightly_test_a3.yaml to
centralize trigger evaluation:

`schedule / workflow_dispatch`: runs all tests with the pre-built image
(existing behavior preserved)
`pull_request (labeled + synchronize)`: runs only when:The PR has the
nightly-test label, and /nightly [test-names] comment exists (latest one
wins)

1. /nightly or /nightly all — runs all tests
2. /nightly test1 test2 — runs only named tests (comma-wrapped for exact
matching)

#### How to trigger
1. Add the nightly-test label to your PR
2. Comment /nightly (all tests) or /nightly test1 test2 (specific tests)
4. Re-triggering: add another /nightly comment and push a new commit
(synchronize event)

### Does this PR introduce _any_ user-facing change?
None

### How was this patch tested?

- vLLM version: v0.14.1
- vLLM main:
dc917cceb8

---------

Signed-off-by: hfadzxy <starmoon_zhang@163.com>

.github/workflows/_e2e_nightly_single_node.yaml

@@ -36,6 +36,16 @@ on:
       name:
         required: false
         type: string
+      vllm_version:
+        required: false
+        type: string
+        default: "v0.16.0"
+      is_pr_test:
+        required: true
+        type: boolean
+      is_run:
+        required: true
+        type: boolean
 
 # Bash shells do not use ~/.profile or ~/.bashrc so these shells need to be explicitly
 # declared as "shell: bash -el {0}" on steps that need to be properly activated.
@@ -54,6 +64,7 @@ jobs:
   e2e-nightly:
     name: ${{ inputs.name || inputs.config_file_path || inputs.tests }}
     runs-on: ${{ inputs.runner }}
+    if: ${{ inputs.is_run }}
     timeout-minutes: 600
     container:
       image: ${{ inputs.image }}
@@ -65,6 +76,60 @@ jobs:
         run: |
           npu-smi info
           cat /usr/local/Ascend/ascend-toolkit/latest/"$(uname -i)"-linux/ascend_toolkit_install.info
+      
+      - name: uninstall vlm vllm-ascend and remove code (if pr test)
+        if: ${{ inputs.is_pr_test }}
+        run: |
+          pip uninstall -y vllm vllm-ascend || true
+          rm -rf /vllm-workspace/vllm /vllm-workspace/vllm-ascend
+
+      - name: Checkout vllm-project/vllm repo
+        if: ${{ inputs.is_pr_test }}
+        uses: actions/checkout@v6
+        with:
+          repository: vllm-project/vllm
+          ref: ${{ inputs.vllm_version }}
+          path: ./temp-vllm 
+          fetch-depth: 1
+
+      - name: Checkout vllm-project/vllm-ascend repo
+        if: ${{ inputs.is_pr_test }}
+        uses: actions/checkout@v6
+        with:
+          path: ./temp-vllm-ascend
+          fetch-depth: 1
+
+      - name: Move code to /vllm-workspace
+        if: ${{ inputs.is_pr_test }}
+        run: |
+          mv ./temp-vllm /vllm-workspace/vllm
+          mv ./temp-vllm-ascend /vllm-workspace/vllm-ascend
+          ls -R /vllm-workspace
+
+      - name: Install vllm-project/vllm from source
+        if: ${{ inputs.is_pr_test }}
+        working-directory: /vllm-workspace/vllm
+        run: |
+          VLLM_TARGET_DEVICE=empty pip install -e .
+      
+      - name: Install vllm-project/vllm-ascend
+        if: ${{ inputs.is_pr_test }}
+        working-directory: /vllm-workspace/vllm-ascend
+        env:
+          PIP_EXTRA_INDEX_URL: https://mirrors.huaweicloud.com/ascend/repos/pypi
+        run: |
+          pip install -r requirements-dev.txt
+          pip install -v -e .
+
+      - name: Install aisbench
+        if: ${{ inputs.is_pr_test }}
+        shell: bash -l {0} 
+        run: |
+          git clone -b v3.0-20250930-master --depth 1 https://gitee.com/aisbench/benchmark.git /vllm-workspace/vllm-ascend/benchmark
+          cd /vllm-workspace/vllm-ascend/benchmark
+          pip install pytest asyncio pytest-asyncio
+          pip install -e . -r requirements/api.txt -r requirements/extra.txt
+          python3 -m pip cache purge
 
       - name: Show vLLM and vLLM-Ascend version
         working-directory: /vllm-workspace