[https://nvbugs/5444624][fix] Fix LLM_ROOT in triton_backend build.sh (NVIDIA#6744)

Signed-off-by: Yiqing Yan <[email protected]>
Signed-off-by: Wangshanshan <[email protected]>

Author: yiqingy0

triton_backend/inflight_batcher_llm/scripts/build.sh

@@ -53,7 +53,8 @@ fi
 
 # TODO: Remove specifying Triton version after cmake version is upgraded to 3.31.8
 # Get TRITON_SHORT_TAG from docker/Dockerfile.multi
-LLM_ROOT="$(dirname $0)/../../../.."
+LLM_ROOT=$BUILD_DIR/../../..
+LLM_ROOT=$(cd -- "$LLM_ROOT" && pwd)
 TRITON_SHORT_TAG=$("$LLM_ROOT/jenkins/scripts/get_triton_tag.sh" "$LLM_ROOT")
 cmake -DCMAKE_INSTALL_PREFIX:PATH=`pwd`/install ${BUILD_TESTS_ARG} -DTRITON_COMMON_REPO_TAG=${TRITON_SHORT_TAG} -DTRITON_CORE_REPO_TAG=${TRITON_SHORT_TAG} -DTRITON_THIRD_PARTY_REPO_TAG=${TRITON_SHORT_TAG} -DTRITON_BACKEND_REPO_TAG=${TRITON_SHORT_TAG} ..
 make install