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

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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um    1
uma    1
dois    2
duas    2
três    3
quatro    4
cinco    5
seis    6
sete    7
oito    8
nove    9