fix: avoid logger deadlock on broken error channel

[tedcy]

Overview

This bumps flexi_logger to 0.28.0 and tells it not to panic when its own error output channel is broken.

That is the path hit in #1958. When cache/log/stdout/stderr are on a full filesystem, a secondary logger error can make nydusd stop answering the daemon API.

Related Issues

Fixes #1958

Change Details

• Bump flexi_logger from 0.25.6 to 0.28.0.
• Call .panic_if_error_channel_is_broken(false) in both nydusd logger setup paths.

Test Results

• cargo fmt --check
• cargo check --locked -p nydus-rs
• cargo test -p nydus-rs logger::tests
• I also reran the ENOSPC repro from [Bug] nydusd API hangs after ENOSPC #1958:
  • put blob cache, log file, stdout, and stderr on the same 512 MiB ext4 filesystem
  • filled it to 100%
  • read a real file from the mounted image
  • /api/v1/daemon still returned while the filesystem was full
  • /api/v1/daemon also returned after space was freed

Change Type

• Bug Fix
• Feature Addition
• Documentation Update
• Code Refactoring
• Performance Improvement
• Other (please describe)

Self-Checklist

• I have run a code style check and addressed any warnings/errors.
• I have added appropriate comments to my code (if applicable).
• I have updated the documentation (if applicable).
• I have written appropriate unit tests.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.76%. Comparing base (05c863f) to head (69c1983).

Files with missing lines	Patch %	Lines
src/logger.rs	50.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (50.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1964      +/-   ##
==========================================
+ Coverage   68.52%   72.76%   +4.24%     
==========================================
  Files         210      210              
  Lines       63071    63073       +2     
  Branches    55826    55828       +2     
==========================================
+ Hits        43218    45896    +2678     
+ Misses      18046    15104    -2942     
- Partials     1807     2073     +266     

Files with missing lines	Coverage Δ
src/logger.rs	80.16% <50.00%> (+5.87%)	⬆️

... and 27 files with indirect coverage changes

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[Zephyrcf]

LGTM, thanks!