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

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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jan    january
feb    february
mar    march
apr    april
jun    june
jul    july
aug    august
sep    september
sept    september
oct    october
nov    november
dec    december