Copying symlink from previous stage fails instead of overwriting

Copying symlink from previous stage fails instead of overwriting: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Expected behavior COPY --from=0 X Y where X is a symlink from stage 0 and Y is a pre-existing symlink in the current stage should overwrite Y with X as…

The task

**Expected behavior** `COPY --from=0 X Y` where X is a symlink from stage 0 and Y is a pre-existing symlink in the current stage should overwrite Y with X as it would if neither were symlinks.

Part of FineEnvs/MiMo-V2.6-RL-harbor-code.