ci: fix ParseAddr("localhost"): unable to parse IP

[skl]

Trying to reproduce a test failure with the following error:

API error (400): invalid JSON: ParseAddr("localhost"): unable to parse IP

Reproduced in b1cea4d, root cause:

• [Windows/Ubuntu] Docker Server and Client will be updated to version 29.1.*, Docker Compose will be updated to version 2.40.3 on February 9th, 2026 actions/runner-images#13474

Fixed by using the IP address 127.0.0.1 instead of the hostname localhost in order to pass stricter verification which now requires an IP address.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.41%. Comparing base (354a685) to head (7d64ee3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1293      +/-   ##
==========================================
- Coverage   43.41%   43.41%   -0.01%     
==========================================
  Files         304      304              
  Lines       32779    32779              
==========================================
- Hits        14231    14230       -1     
- Misses      17631    17633       +2     
+ Partials      917      916       -1     

Flag	Coverage Δ
integration-test	21.10% <ø> (+0.03%)	⬆️
integration-test-arm	0.00% <ø> (ø)
integration-test-vm-x86_64-5.15.152	0.00% <ø> (ø)
integration-test-vm-x86_64-6.10.6	0.00% <ø> (ø)
k8s-integration-test	2.36% <ø> (ø)
oats-test	0.00% <ø> (ø)
unittests	44.27% <ø> (-0.01%)	⬇️

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[grcevski]

LGTM!

[pellared]

@skl, thanks a lot