Fix Linux XDP Debug BVT runner crash by adding swap space

[ProjectsByJackHe]

Description

The BVT (Debug, linux, ubuntu-24.04, x64, quictls, -UseSystemOpenSSLCrypto, -Test, -UseXdp) job consistently
crashes the GitHub Actions runner at ~72 minutes — test step logs return HTTP 404 and cleanup steps never run.
The Release variant of the same matrix passes reliably.

Root cause: OOM. GitHub-hosted runners have 7 GB RAM. The Debug + XDP combination exhausts this due to:

• Unoptimized Debug binaries (larger memory footprint)
• XDP UMEM allocations (16K frames of pinned kernel memory per AF_XDP socket)
• Parallel test execution under sudo

When the Linux OOM-killer fires, it can kill the runner agent itself (not just the test process), causing the
full runner disconnect.

This adds a 6 GB swap file on Linux XDP runners before tests run, giving ~13 GB total virtual memory. The swap
file is on the runner's ephemeral SSD so performance impact is minimal. Only Linux XDP matrices are affected —
all other jobs are unchanged.

Testing

CI

Documentation

No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.80%. Comparing base (f9c01c7) to head (b39cc8e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5919      +/-   ##
==========================================
- Coverage   86.18%   85.80%   -0.38%     
==========================================
  Files          60       60              
  Lines       18731    18731              
==========================================
- Hits        16143    16073      -70     
- Misses       2588     2658      +70     

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