fix(ci): evaluate release digest without input

[kl3inIT]

Root cause

The immutable-release verifier invoked jq without -n while only using --arg values. With no stdin, jq exited 4 before writing release-images.json even though all six images built successfully.

Fix

Evaluate the digest regex with jq -en.

Verification

• actionlint 1.7.12 + ShellCheck 0.11.0
• reproduced against a real sha256 digest

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📥 Commits

Reviewing files that changed from the base of the PR and between 65dfc6a and f514526.

📒 Files selected for processing (1)

• .github/workflows/build-images.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-manifest-validation

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