ci: graceful-skip ggshield when GITGUARDIAN_API_KEY isn't set

[tablackburn]

Summary

Propagates PowerShellModuleTemplate#28 to this repo. Updates .github/workflows/ggshield.yaml to use the env-passthrough pattern so the GitGuardian Scan job no-ops cleanly when GITGUARDIAN_API_KEY isn't configured, instead of failing the workflow run.

Why

Defensive alignment with the template's new convention. This repo currently has GITGUARDIAN_API_KEY set, so there's no behavior change today — the gate evaluates true and the scan runs as before. The value is for any future state where the secret is rotated, removed, or unset.

Notes

• The secrets context isn't available in if: expressions, so the gate uses job-level env + step-level if: env.X != ''.
• The explicit Dependabot actor check is kept for self-documentation, even though Dependabot PRs would now be skipped naturally by the env check (no secret access).

Test plan

• CI passes (existing required checks)
• GitGuardian Scan runs (gate evaluates true here)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4e2e9c2e-5839-4432-b6de-fca70f01678a

📥 Commits

Reviewing files that changed from the base of the PR and between c48bed5 and 8af9b36.

📒 Files selected for processing (1)

• .github/workflows/ggshield.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/graceful-skip-missing-secrets

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[Copilot]

Pull request overview

Updates the GitGuardian Scan GitHub Actions workflow to gracefully no-op when GITGUARDIAN_API_KEY is not configured, preventing unnecessary workflow failures (especially for actors/events without secret access).

Changes:

• Adds a job-level passthrough of GITGUARDIAN_API_KEY and gates scan steps on it being non-empty.
• Keeps the Dependabot actor skip while shifting secret-presence gating to step-level if: conditions.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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