Use fork for worker multiprocessing method (vllm-project#29)

It's faster

Signed-off-by: Nick Hill <[email protected]>

Author: njhill

Dockerfile.ubi

@@ -268,7 +268,8 @@ ENV HF_HUB_OFFLINE=1 \
     PORT=8000 \
     GRPC_PORT=8033 \
     HOME=/home/vllm \
-    VLLM_USAGE_SOURCE=production-docker-image
+    VLLM_USAGE_SOURCE=production-docker-image \
+    VLLM_WORKER_MULTIPROC_METHOD=fork
 
 # setup non-root user for OpenShift
 RUN microdnf install -y shadow-utils \