ci: publish Linux packages for the Agent to GitHub releases

[Marc-André Moreau (mamoreau-devolutions)]

Adds the Devolutions Agent Linux packages (DEB, RPM, and changes) for both x64 and arm64 architectures to the GitHub release assets, alongside the existing Windows MSI and symbols.

This makes the Linux Agent builds downloadable directly from the GitHub release page, matching the set of artifacts already published to OneDrive.

[Marc-André Moreau (mamoreau-devolutions)]

Implementation notes:

• Updated the github-release job in .github/workflows/release.yml.
• Added a loop for both x64 and �rm64 Linux Agent artifacts (.deb, .rpm, .changes).
• Naming follows the existing Gateway Linux release convention: devolutions-agent--.{deb,rpm,changes}.
• Source paths use the already-existing devolutions-agent-signed artifact layout (devolutions-agent/linux//...), which is also used by the OneDrive upload step.
• No build or packaging changes were needed; the Linux ARM64 and x64 packages are already produced by CI.

[github-actions]

Let maintainers know that an action is required on their side

• Add the label release-required Please cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module) when you request a maintainer to cut a new release (Devolutions Gateway, Devolutions Agent, Jetsocat, PowerShell module)

• Add the label release-blocker Follow-up is required before cutting a new release if a follow-up is required before cutting a new release

• Add the label publish-required Please publish libraries (`Devolutions.Gateway.Utils`, OpenAPI clients, etc) when you request a maintainer to publish libraries (Devolutions.Gateway.Utils, OpenAPI clients, etc.)

• Add the label publish-blocker Follow-up is required before publishing libraries if a follow-up is required before publishing libraries

[Copilot]

Pull request overview

Publishes Devolutions Agent Linux packages alongside existing GitHub release assets.

Changes:

• Adds DEB, RPM, and changes files for x64 and arm64.
• Applies versioned release asset names consistent with existing packaging.

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