[Doctest] add installation doctest (#1179)

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

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
CI passed

Related: https://github.com/vllm-project/vllm-ascend/pull/983

Co-authored-by: wangli <wangli858794774@gmail.com>

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>
Co-authored-by: wangli <wangli858794774@gmail.com>

.github/workflows/vllm_ascend_doctest.yaml

@@ -46,7 +46,7 @@ jobs:
       # Each version should be tested
       fail-fast: false
       matrix:
-        vllm_verison: [main, v0.7.3-dev, main-openeuler, v0.7.3-dev-openeuler]
+        vllm_verison: [v0.9.1-dev, v0.9.1-dev-openeuler, main, main-openeuler]
     name: vLLM Ascend test
     runs-on: linux-arm64-npu-1
     container:
@@ -70,13 +70,13 @@ jobs:
         run: |
           sed -i 's|ports.ubuntu.com|mirrors.tuna.tsinghua.edu.cn|g' /etc/apt/sources.list
           apt-get update -y
-          apt install git curl -y
+          apt install -y gcc g++ libnuma-dev git curl jq
 
       - name: Config OS mirrors - openEuler
         if: ${{ endsWith(matrix.vllm_verison, '-openeuler') }}
         run: |
           yum update -y
-          yum install git curl -y
+          yum install -y gcc g++ numactl-devel git curl jq
 
       - name: Config pip mirrors
         run: |
@@ -88,11 +88,13 @@ jobs:
       - name: Run vllm-ascend/tests/e2e/run_doctests.sh
         run: |
           # PWD: /__w/vllm-ascend/vllm-ascend
-          # Address old branch like v0.7.3:
-          if [ ! -d /vllm-workspace/vllm-ascend/tests/e2e ]; then
-            echo "Warning: the doctest path doesn't exists, copy now"
-            cp -r tests/e2e /vllm-workspace/vllm-ascend/tests/
-          fi
+          echo "Replacing /vllm-workspace/vllm-ascend/tests/e2e ..."
+          rm -rf /vllm-workspace/vllm-ascend/tests/e2e
+          mkdir -p /vllm-workspace/vllm-ascend/tests
+          cp -r tests/e2e /vllm-workspace/vllm-ascend/tests/
+
+          # TODO(yikun): Remove this after conf.py merged
+          cp docs/source/conf.py /vllm-workspace/vllm-ascend/docs/source/
 
           # Simulate container to enter directory
           cd /workspace