ci: block releases with open release blockers

[dkropachev]

Summary

• block production releases when an open issue has the release-blocker label
• report blocking issue title and URL
• keep dry-run releases available
• grant the workflow token read-only issue access

Branch coverage

• this PR guards active scylla-3.x
• ci: block releases with open release blockers #1077 guards scylla-4.x

Validation

• actionlint 1.7.12
• guard succeeds when no blocker exists
• guard fails when an open blocker exists
• API failures fail closed

[qodo-scylladb]

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Run ID: 437bcf67-428c-471e-b528-e4015142b501

📥 Commits

Reviewing files that changed from the base of the PR and between 76602d2 and 721bb2c.

📒 Files selected for processing (1)

• .github/workflows/release.yml

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[Copilot]

🟢 Approval recommended

The workflow correctly blocks production releases, preserves dry runs, and handles API failures safely.

Pull request overview

Adds a fail-closed guard preventing production releases while open release-blocker issues exist.

Changes:

• Grants read-only issue access.
• Checks blockers before and after release preparation.
• Exempts dry-run releases.

File summaries

File	Description
.github/workflows/release.yml	Adds release-blocker checks and issue permissions.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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