in9a71543fd2, we introduced a regression, which failed to use the proper value for the container image in which the iwyu workflow is run. in this change, we pass the correct value, as we do in clang-tidy.yaml workflow. Refs9a71543fd2Fixes scylladb/scylladb#19704 Signed-off-by: Kefu Chai <kefu.chai@scylladb.com> Closes scylladb/scylladb#19697