Migrate: pick latest instead of oldest snapshot with --latest-only

[bob1de]

Fix #1414

[bob1de]

I've got zero experience with golang, but this should be simple enough I guess...

[codecov]

Codecov Report

Merging #1420 (0cba114) into master (789a739) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1420      +/-   ##
==========================================
+ Coverage   68.33%   68.35%   +0.02%     
==========================================
  Files         366      366              
  Lines       28862    28862              
==========================================
+ Hits        19722    19728       +6     
+ Misses       7492     7489       -3     
+ Partials     1648     1645       -3     

Impacted Files	Coverage Δ
cli/command_snapshot_migrate.go	52.70% <0.00%> (ø)
repo/grpc_repository_client.go	77.67% <0.00%> (-0.72%)	⬇️
internal/epoch/epoch_manager.go	84.09% <0.00%> (-0.57%)	⬇️
repo/blob/sharded/sharded.go	86.70% <0.00%> (+1.89%)	⬆️
repo/blob/filesystem/filesystem_storage.go	66.31% <0.00%> (+2.13%)	⬆️
internal/cache/persistent_lru_cache.go	82.27% <0.00%> (+3.79%)	⬆️

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[jkowalski]

golang requires particular canonical file formatting, in particular len(s)-1 without spaces. I'm guessing you did not use gofmt to format the file after changing.

In any case I recommend using some proper code editor which formats automatically - Visual Studio Code is very good and magically does all of this.

[bob1de]

Alright, using gofmt now.

[jkowalski]

We should also add a test, but if you're not up for it (which I totally understand), I'll just add it myself.

[bob1de]

Yes, would be great if you did it. Thanks very much.