fix ci: add fetch-depth: 2 to checkout step to fix codecov

[matt-codecov]

github puts a merge commit at the top of every PR. the CLI is supposed to detect that and use the actual PR head as the SHA instead of the merge commit, but because we were missing this fetch-depth argument, the local checkout only had the merge commit in it.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.51%. Comparing base (4de8f9e) to head (238eeaa).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #545   +/-   ##
=======================================
  Coverage   88.51%   88.51%           
=======================================
  Files         451      451           
  Lines       13127    13127           
  Branches     1529     1529           
=======================================
  Hits        11620    11620           
  Misses       1184     1184           
  Partials      323      323           

Flag	Coverage Δ
shared-docker-uploader	88.51% <ø> (ø)

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[codspeed-hq]

CodSpeed Performance Report

Merging #545 will create unknown performance changes

_{Comparing matt/fix-ci-fetch-depth (238eeaa) with main (4de8f9e)}

Summary

⚠️ No benchmarks were detected in both the base of the PR and the PR.\

[Swatinem]

We recently chatted around the concept of "adapt our product so it works with the customers setup", vs "the customer has to update their CI/codebase to work with our product".

The PR description is good, but I would like to better understand why we can’t just fix this case in the CLI, or server side for that matter?
I don’t think we can ever explain all customers that they would have to add this to their CI. So is everyone broken in some way now? Or only folks using the github merge queue?

[matt-codecov]

The PR description is good, but I would like to better understand why we can’t just fix this case in the CLI, or server side for that matter?

@Swatinem good idea, i mentioned it in codecov/engineering-team#3406

I don’t think we can ever explain all customers that they would have to add this to their CI. So is everyone broken in some way now? Or only folks using the github merge queue?

i think everyone that doesn't have fetch-depth: 2 (or 0). not sure if the GHA somehow avoids this with its own checkout step or something, don't think so. but that's not new, that's always been the case