fix: harden docker smoke packaging

scripts/lib/live-docker-stage.sh

@@ -54,13 +54,21 @@ openclaw_live_stage_state_dir() {
     # Sandbox workspaces can accumulate root-owned artifacts from prior Docker
     # runs. They are not needed for live-test auth/config staging and can make
     # temp-dir cleanup fail on exit, so keep them out of the staged state copy.
+    set +e
     tar -C "$source_dir" \
+      --warning=no-file-changed \
+      --ignore-failed-read \
       --exclude=workspace \
       --exclude=sandboxes \
       --exclude=relay.sock \
       --exclude='*.sock' \
       --exclude='*/*.sock' \
       -cf - . | tar -C "$dest_dir" -xf -
+    local status=$?
+    set -e
+    if [ "$status" -gt 1 ]; then
+      return "$status"
+    fi
     chmod -R u+rwX "$dest_dir" || true
     if [ -d "$source_dir/workspace" ] && [ ! -e "$dest_dir/workspace" ]; then
       ln -s "$source_dir/workspace" "$dest_dir/workspace"