only freeze in rank 0

[njzjz]

Fix #2272.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (64a5aa8) 72.47% compared to head (b90158b) 75.19%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2937      +/-   ##
==========================================
+ Coverage   72.47%   75.19%   +2.71%     
==========================================
  Files         245      245              
  Lines       24687    24690       +3     
  Branches     1599     1599              
==========================================
+ Hits        17893    18565     +672     
+ Misses       5862     5189     -673     
- Partials      932      936       +4     

Files	Coverage Δ
deepmd/entrypoints/freeze.py	59.30% <75.00%> (+0.13%)	⬆️

... and 35 files with indirect coverage changes

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