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fix: disable NCCL shared memory to avoid /dev/shm limit in Kubernetes

Kubernetes pods get 64MB /dev/shm by default. NCCL needs more for
its communication buffers, causing checkpoint save to fail with
"Error while creating shared memory segment". Set NCCL_SHM_DISABLE=1
to use network sockets instead.

Also reduce wait_for_job_status timeout to 60s since training
completes quickly and the main wait happens in get_job_logs.

Signed-off-by: XploY04 <2004agarwalyash@gmail.com>