message: makefile: set env TEST_WORKDIR_PREFIX for ut
  Ut now puts its temp artifacts into a dir specified by the env.
diff: @@ -79,7 +79,7 @@ PACKAGES = rafs storage
  ut:
  echo "Testing packages: ${PACKAGES}"
  $(foreach var,$(PACKAGES),cargo test $(FUSEDEV_COMMON) -p $(var);)
  - RUST_BACKTRACE=1 cargo test $(FUSEDEV_COMMON) --bins -- --nocapture --test-threads=8
  + TEST_WORKDIR_PREFIX=$(TEST_WORKDIR_PREFIX) RUST_BACKTRACE=1 cargo test $(FUSEDEV_COMMON) --bins -- --nocapture --test-threads=8
  ifdef NYDUS_TEST_VIRTIOFS
  # If virtiofs test must be performed, only run binary part since other package is not affected by feature - virtiofs
  # Use same traget to avoid re-compile for differnt targets like gnu and musl
  