ci: Change of not signing the Installer after build

[jakub-kocka]

Description

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Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• [ ] 🚨 This PR does not introduce breaking changes.
• [ ] All CI checks (GH Actions) pass.
• [ ] Documentation is updated as needed.
• [ ] Tests are updated or added as necessary.
• [ ] Code is well-commented, especially in complex areas.
• [ ] Git history is clean — commits are squashed to the minimum necessary.