Enable spotless index

[snuyanzin]

Also more info about it
https://github.com/diffplug/spotless/tree/main/plugin-maven#incremental-up-to-date-checking-and-formatting

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.51%. Comparing base (db65b75) to head (85c6fff).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1860      +/-   ##
============================================
- Coverage     92.58%   92.51%   -0.08%     
+ Complexity     3565     3562       -3     
============================================
  Files           346      346              
  Lines          7050     7050              
  Branches        684      684              
============================================
- Hits           6527     6522       -5     
- Misses          363      365       +2     
- Partials        160      163       +3     

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[asolntsev]

@snuyanzin Do understand correctly that it will help during local development, but would not be used in GitHub Actions?
Maybe we want to share the index between GitHub Actions builds as well?

[snuyanzin]

yes, it is for local only

my current fear about ci: I don't know how to review it since it will appear in every PR after that

[asolntsev]

We can create a separate branch like "main2" with the shared index, and create few PRs to "main2".
And we'll see how it works.

But this is optional, of course.
Improving the local development is already a step forward.

[snuyanzin]

looks like spotless.ratchFrom can do for ci what we need

    <ratchetFrom>origin/main</ratchetFrom>

https://github.com/diffplug/spotless/tree/main/plugin-maven#ratchet

[snuyanzin]

to make generic in case of multiple branches

[snuyanzin]

test commit shows spotless keeps working https://github.com/datafaker-net/datafaker/actions/runs/28367702772/job/84037564425?pr=1860