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

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

1
2
3
4
5
6
7
8
9
one    1
two    2
three    3
four    4
five    5
six    6
seven    7
eight    8
nine    9