Add a checkpointing address

[simone-silvestri]

that follows the convention of Oceananigans

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.47%. Comparing base (29101ce) to head (809b9be).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sea_ice_model.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   65.54%   65.47%   -0.08%     
==========================================
  Files          28       28              
  Lines         894      895       +1     
==========================================
  Hits          586      586              
- Misses        308      309       +1     

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