terra-transformer validate internally calls terraform init, which clones
git-based modules. In git worktrees, pre-commit's stash mechanism holds the
worktree index in a transient state. Terraform's git clone operations can
interact with that index and corrupt it.

Unset GIT_DIR, GIT_WORK_TREE, and GIT_INDEX_FILE before calling
terra-transformer validate so that terraform's git operations are isolated
from the parent repository context.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

fix: isolate git context in terra-transformer-validate-roots pre-commit hook

See merge request !1439

## [3.19.3](https://gitlab.com/gitlab-com/gl-infra/common-ci-tasks/-/compare/...) (2026-04-23)

### Fixes

* isolate git context in terra-transformer-validate-roots pre-commit hook ([5177236a](5177236a))