Dockerfile.ubi: get rid of custom cache manager

fixed in vllm-project#6140

fixes https://issues.redhat.com/browse/RHOAIENG-8043

Dockerfile.ubi

@@ -154,9 +154,6 @@ ENV PATH=$VIRTUAL_ENV/bin/:$PATH
 RUN microdnf install -y gcc \
     && microdnf clean all
 
-# Custom cache manager (fix for https://issues.redhat.com/browse/RHOAIENG-8043)
-COPY extras/custom_cache_manager.py /opt/vllm/lib/python3.11/site-packages/custom_cache_manager.py
-
 # install vllm wheel first, so that torch etc will be installed
 RUN --mount=type=bind,from=build,src=/workspace/dist,target=/workspace/dist \
     --mount=type=cache,target=/root/.cache/pip \
@@ -174,8 +171,7 @@ ENV HF_HUB_OFFLINE=1 \
     PORT=8000 \
     HOME=/home/vllm \
     VLLM_USAGE_SOURCE=production-docker-image \
-    VLLM_WORKER_MULTIPROC_METHOD=fork \
-    TRITON_CACHE_MANAGER="custom_cache_manager:CustomCacheManager"
+    VLLM_WORKER_MULTIPROC_METHOD=fork
 
 # setup non-root user for OpenShift
 RUN umask 002 \