fix multiproc executor determine kv cache memory & update Dockerfile

Dockerfile.openEuler

@@ -21,10 +21,6 @@ ARG PIP_INDEX_URL="https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple"
 ARG MOONCAKE_TAG="v0.3.8.post1"
 ARG SOC_VERSION="ascend910b1"
 
-ENV SOC_VERSION=$SOC_VERSION \
-    TASK_QUEUE_ENABLE=1 \
-    OMP_NUM_THREADS=1
-
 RUN pip config set global.index-url ${PIP_INDEX_URL}
 
 WORKDIR /workspace
@@ -58,6 +54,11 @@ RUN VLLM_TARGET_DEVICE="empty" python3 -m pip install -e /vllm-workspace/vllm/[a
     python3 -m pip cache purge
 
 # Install vllm-ascend
+ENV SOC_VERSION=$SOC_VERSION \
+    TASK_QUEUE_ENABLE=1 \
+    OMP_NUM_THREADS=1 \
+    VLLM_WORKER_MULTIPROC_METHOD=spawn \
+    VLLM_ASCEND_ENABLE_VNPU=1
 # Installing vllm-ascend on x86 can pull upstream triton back in alongside triton-ascend. Remove it immediately after this step.
 RUN export PIP_EXTRA_INDEX_URL=https://mirrors.huaweicloud.com/ascend/repos/pypi && \
     source /usr/local/Ascend/ascend-toolkit/set_env.sh && \
@@ -86,9 +87,6 @@ RUN export PIP_EXTRA_INDEX_URL=https://mirrors.huaweicloud.com/ascend/repos/pypi
     python3 -m pip install "https://vllm-ascend.obs.cn-north-4.myhuaweicloud.com/vllm-ascend/${PTA_WHEEL}" && \
     python3 -m pip cache purge
 
-ENV VLLM_WORKER_MULTIPROC_METHOD=spawn \
-    VLLM_ASCEND_ENABLE_VNPU=1
-
 # Install clang (for triton-ascend)
 RUN yum update -y && \
     yum install -y clang && \