fix error="io: read/write on closed pipe" on k8s backend

[pat-s]

ref #1616

Seeing these errors a lot in the k8s backend.

│ 8:47AM ERR copy limited logStream part error="io: read/write on closed pipe" image=docker.io/woodpeckerci/plugin-git:2.5.1 pipeline=45 repo=images/misc workflow_id=9053                                 │
│ 8:47AM ERR copy limited logStream part error="io: read/write on closed pipe" image=docker.io/woodpeckerci/plugin-git:2.5.1 pipeline=45 repo=images/misc workflow_id=9054  

I don't know if this fixes it but the linked fix addressed exactly that for the docker backend. Can anyone infer if this might be applicable?