ci: remove unused package scripts, backport fixes into tlk.ps1

[Copilot]

ci/package-gateway-deb.ps1 and ci/package-gateway-rpm.ps1 were introduced in #1246 as a refactor of the Linux packaging logic out of tlk.ps1, but were never wired into any workflow. The code diverged, and the split scripts accumulated both fixes and bugs. Rather than completing the incomplete refactor, this deletes the dead scripts and backports the meaningful fixes.

Deleted

• ci/package-gateway-deb.ps1 — unreferenced, gateway-only, has a broken $Target variable
• ci/package-gateway-rpm.ps1 — unreferenced, gateway-only

Backported into tlk.ps1

• chmod +x $RulesFile after template generation — fixes dpkg-buildpackage warning about debian/rules missing the execute bit
• RPM now generates its own copyright file instead of reusing the Debian-formatted one, removing an implicit deb→rpm ordering dependency:

  $RpmCopyrightFile = Join-Path $OutputPath "copyright_rpm"
  "Copyright $($(Get-Date).Year) Devolutions Inc. All rights reserved." | Set-Content -Path $RpmCopyrightFile

Cleaned up

• Removed the {{ dh_shlibdeps }} template token from both package/Linux/gateway/template/rules and package/AgentLinux/agent/template/rules (empty override kept to suppress default behavior on cross-compiled binaries)
• Removed corresponding $DhShLibDepsOverride variable and token-passing in tlk.ps1

[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

This PR removes unused Linux gateway packaging scripts and consolidates the relevant fixes back into the active ci/tlk.ps1 packaging path.

Changes:

• Deletes unreferenced standalone Debian/RPM gateway packaging scripts.
• Adds executable permission handling for generated Debian rules.
• Generates an RPM-specific copyright file and removes the unused dh_shlibdeps template token.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ci/tlk.ps1	Backports packaging fixes into the live Linux packaging workflow.
ci/package-gateway-deb.ps1	Removes unused Debian gateway packaging script.
ci/package-gateway-rpm.ps1	Removes unused RPM gateway packaging script.
package/Linux/gateway/template/rules	Removes unused dh_shlibdeps token from gateway Debian rules template.
package/AgentLinux/agent/template/rules	Removes unused dh_shlibdeps token from agent Debian rules template.

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[Benoît Cortier (CBenoit)]

Resulting .DEB and .RPM packages are still behaving as expected even with the backported fixes.