[TRTLLM-9018][infra] add mirror for Build-Docker-Images stage (NVIDIA#9063)

Signed-off-by: ZhanruiSunCh <184402041+ZhanruiSunCh@users.noreply.github.com>
Signed-off-by: Zhanrui Sun <184402041+ZhanruiSunCh@users.noreply.github.com>

Author: ZhanruiSunCh

docker/common/install_nixl.sh

@@ -17,7 +17,6 @@ fi
 
 if [ -n "${GITHUB_MIRROR}" ]; then
   export PIP_INDEX_URL="https://urm.nvidia.com/artifactory/api/pypi/pypi-remote/simple"
-  export NIXL_REPO="https://gitlab-master.nvidia.com/ftp/GitHubSync/nixl.git"
 fi
 pip3 install --no-cache-dir meson ninja pybind11
 

docker/common/install_ucx.sh

@@ -6,10 +6,6 @@ UCX_INSTALL_PATH="/usr/local/ucx/"
 CUDA_PATH="/usr/local/cuda"
 UCX_REPO="https://github.com/openucx/ucx.git"
 
-if [ -n "${GITHUB_MIRROR}" ]; then
-  export UCX_REPO="https://gitlab-master.nvidia.com/ftp/GitHubSync/ucx.git"
-fi
-
 rm -rf ${UCX_INSTALL_PATH}
 git clone --depth 1 -b ${UCX_VERSION} ${UCX_REPO}
 cd ucx