Enable model cache for Rocm docker compose test. (#1614)

Signed-off-by: ZePan110 <ze.pan@intel.com>

CodeGen/docker_compose/amd/gpu/rocm/compose.yaml

@@ -9,7 +9,7 @@ services:
     ports:
       - "${CODEGEN_TGI_SERVICE_PORT:-8028}:80"
     volumes:
-      - "/var/lib/GenAI/data:/data"
+      - "${MODEL_CACHE:-/var/lib/GenAI/data}:/data"
     environment:
       no_proxy: ${no_proxy}
       http_proxy: ${http_proxy}