Use sparse checkout in E2E workflow

[kamilzyla]

Changes

Use actions/checkout@v4 with sparse-checkout instead of Bhacaz/checkout-files@v2, which is not very popular and doesn't seem to work on PRs originating from external repositories (problem encountered on #496).

How to test

If the E2E workflow still passes, we should be good.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a5da6c5) 17.82% compared to head (4ccc481) 17.82%.

❗ Current head 4ccc481 differs from pull request most recent head 7be491c. Consider uploading reports for the commit 7be491c to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #545   +/-   ##
=======================================
  Coverage   17.82%   17.82%           
=======================================
  Files           9        9           
  Lines         404      404           
=======================================
  Hits           72       72           
  Misses        332      332           

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[jakubnowicki]

@kamilzyla the CI fails for Ubuntu - oldrel, PTAL.

[kamilzyla]

@jakubnowicki Our E2E tests are flaky - Cypress times out occasionally. Passed on 3rd attempt.

[jakubnowicki]

@jakubnowicki Our E2E tests are flaky - Cypress times out occasionally. Passed on 3rd attempt.

Can we do anything about that? Please at least add an issue.

[jakubnowicki]

LGTM

[kamilzyla]

I'm confident we can do something about it, but I think it needs a deeper investigation. Issue created here: #546.