ci: pin hadolint image and skip docker login on fork PRs

[chizy7]

Pins the hadolint pre-commit hook to its v2.12.0 image (the upstream hook runs :latest, which drifted and broke lint on every open PR) and skips the Docker Hub login on fork PRs, where repository secrets are never available.

[coderabbitai]

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⚙️ Run configuration

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📥 Commits

Reviewing files that changed from the base of the PR and between cc635f1 and 0c5389b.

📒 Files selected for processing (2)

• .github/workflows/docker-test.yml
• .pre-commit-config.yaml

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