Revert "WA for the issue of vllm Dockerfile.cpu build failure (opea-project#1195)" (opea-project#1206)

Author: ZePan110

.github/workflows/_example-workflow.yml

@@ -75,7 +75,7 @@ jobs:
           docker_compose_path=${{ github.workspace }}/${{ inputs.example }}/docker_image_build/build.yaml
           if [[ $(grep -c "vllm:" ${docker_compose_path}) != 0 ]]; then
               git clone https://github.com/vllm-project/vllm.git
-              cd vllm && git checkout 446c780 && cd ../
+              cd vllm && git rev-parse HEAD && cd ../
           fi
           if [[ $(grep -c "vllm-gaudi:" ${docker_compose_path}) != 0 ]]; then
                git clone https://github.com/HabanaAI/vllm-fork.git

ChatQnA/docker_image_build/build.yaml

@@ -113,12 +113,12 @@ services:
       dockerfile: comps/guardrails/llama_guard/langchain/Dockerfile
     extends: chatqna
     image: ${REGISTRY:-opea}/guardrails-tgi:${TAG:-latest}
-  # vllm:
-  #   build:
-  #     context: vllm
-  #     dockerfile: Dockerfile.cpu
-  #   extends: chatqna
-  #   image: ${REGISTRY:-opea}/vllm:${TAG:-latest}
+  vllm:
+    build:
+      context: vllm
+      dockerfile: Dockerfile.cpu
+    extends: chatqna
+    image: ${REGISTRY:-opea}/vllm:${TAG:-latest}
   vllm-gaudi:
     build:
       context: vllm-fork