osdc/hf-cache: self-heal rclone mount across a dead FUSE#876
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When rclone dies (e.g. OOM), the FUSE at /mnt/hf_cache goes stale
("transport endpoint is not connected"); containerd can't stat the
volumeMount source, so the rclone container can't restart and every job
pod on the node wedges in CreateContainerError until a manual umount.
Bidirectional-mount the stable parent /mnt instead of /mnt/hf_cache, so
containerd always stats a live dir and rclone restarts cleanly, clearing
the stale FUSE via its own fusermount -uz. The init container also clears
a dead FUSE and makes /mnt an rshared mountpoint (kubelet MakeRShared
needs one) for the pod-recreation path.
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When rclone dies (e.g. OOM), the FUSE at `/mnt/hf_cache` goes stale ("transport endpoint is not connected") and containerd can't stat the volumeMount source, so the rclone container can't restart and every job pod on the node wedges in `CreateContainerError` until a manual `umount`.
rclone now Bidirectional-mounts the stable parent `/mnt` instead of `/mnt/hf_cache`, so containerd always stats a live dir and the mount self-heals on restart. Follow-up to #874.