tests/e2e: don't rely DNS to get host's IP for container access

[BeryJu]

Details

REPLACE ME

---

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

[netlify]

✅ Deploy Preview for authentik-storybook canceled.

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🔨 Latest commit	25181d0
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[netlify]

✅ Deploy Preview for authentik-docs canceled.

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🔨 Latest commit	25181d0
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (3eccef8) to head (25181d0).
Report is 5 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13640      +/-   ##
==========================================
- Coverage   92.75%   92.21%   -0.54%     
==========================================
  Files         794      794              
  Lines       40508    40508              
==========================================
- Hits        37572    37355     -217     
- Misses       2936     3153     +217     

Flag	Coverage Δ
e2e	45.12% <ø> (-2.85%)	⬇️
integration	24.30% <ø> (ø)
unit	90.52% <ø> (-0.01%)	⬇️

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