fix: make tests pass without /etc/localtime

[felixonmars]

Handle ENOENT from std::filesystem::symlink_status() when resolving /etc/localtime, so the existing UTC fallback is reachable in clean Arch build chroots where /etc/localtime is absent.

[deepin-ci-robot]

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This pull-request has been approved by: felixonmars

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[gemini-code-assist]

Code Review

This pull request updates the 'RunContext::resolveTimeZone' method in 'run_context.cpp' to handle cases where the local time file does not exist. Specifically, if 'std::filesystem::symlink_status' returns a 'no_such_file_or_directory' error, the timezone is defaulted to "UTC" and the function returns successfully instead of failing. There are no review comments, and I have no additional feedback to provide.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
libs/linglong/src/linglong/runtime/run_context.cpp	0.00%	3 Missing ⚠️

Files with missing lines	Coverage Δ
libs/linglong/src/linglong/runtime/run_context.cpp	15.10% <0.00%> (-0.08%)	⬇️

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