build: use domestic Rust mirror on JD node

scripts/build-windows-jd-cross.sh

@@ -22,6 +22,8 @@ command -v node >/dev/null || { echo "Node.js is required." >&2; exit 2; }
 
 if ! command -v cargo >/dev/null 2>&1; then
   command -v curl >/dev/null || { echo "curl is required to install Rust." >&2; exit 2; }
+  export RUSTUP_DIST_SERVER="${RUSTUP_DIST_SERVER:-https://rsproxy.cn}"
+  export RUSTUP_UPDATE_ROOT="${RUSTUP_UPDATE_ROOT:-https://rsproxy.cn/rustup}"
   curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile minimal
 fi
 export PATH="$HOME/.cargo/bin:$PATH"