[boxrouter-maintainer]

saveWorkdirMeta resolves the working directory through a login shell, but previously discarded the image's EnvVars and treated any stderr output as a failed lookup. Login hooks that emit diagnostics could therefore break workdir metadata resolution even when the command succeeded.

Pass the image environment to the lookup command and identify its final absolute path with a dedicated marker. Collect streamed stdout and stderr, accept a valid marked path when the command succeeds, and preserve command failures and all metadata except the resolved WorkDir.

Validation:

• go test ./pkg/template/build/commands -run 'TestSaveWorkdirMetaFromOutput' -count=1
• login-shell regression script covering hook stdout/stderr and nonzero exit preservation
• git diff --check

[cla-bot]

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[boxrouter-maintainer]

@cla-bot check

[cla-bot]

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