Bugfix: Only allow rank==0 to clean up old checkpoints (#2558)

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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g mail    gmail
gmail
n vidia    nvidia
nvidia
outlook
hotmail
yahoo
aol
gmx
msn
live
yandex
orange
wanadoo
web
google
comcast