fix(test): isolate GPG signing key unit tests from host git config

[skevetter]

Summary

The writeGitConfig() test helper in cmd/ssh_test.go sets HOME, XDG_CONFIG_HOME, and GIT_CONFIG_GLOBAL to isolate tests from host git configuration, but does not block system-level or local repository git config from leaking through. On hosts with a GPG signing key configured (in /etc/gitconfig or the repo's .git/config), the host key corrupts test assertions.

This adds GIT_CONFIG_SYSTEM pointed to /dev/null and GIT_DIR pointed to a fresh empty .git directory in the temp home, fully isolating all six TestGpgSigningKey_* tests from any host git configuration.

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Configuration used: Organization UI

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Run ID: 1425a502-0a40-4b43-b7b1-e3da080f4f1e

📥 Commits

Reviewing files that changed from the base of the PR and between ad731d4 and e81625e.

📒 Files selected for processing (1)

• cmd/ssh_test.go

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