fix(docker_test): 修复 Docker Test 报错未捕获的问题

[he0119]

顺便优化了 plugin_test 的输入和输出。

[codecov]

Codecov Report

Attention: Patch coverage is 84.84848% with 5 lines in your changes missing coverage. Please review.

Project coverage is 91.29%. Comparing base (fed3f0f) to head (e2d2ca8).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/providers/docker_test/plugin_test.py	85.71%	3 Missing ⚠️
src/providers/docker_test/__init__.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #296      +/-   ##
==========================================
- Coverage   91.41%   91.29%   -0.13%     
==========================================
  Files          39       39              
  Lines        2132     2124       -8     
==========================================
- Hits         1949     1939      -10     
- Misses        183      185       +2     

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