feat(agent): bundle multi-pwsh with Windows installer

[Adam Driscoll (adamdriscoll)]

This pull request adds support for downloading and integrating the multi-pwsh executable into the Windows agent build and packaging process. The changes automate fetching the correct multi-pwsh binary for the target architecture, ensure the executable is available as a build artifact, and update the MSI packaging to include it.

Integration of multi-pwsh into build and packaging:

• Added a new script ci/download-multi-pwsh.ps1 to download and extract the appropriate multi-pwsh binary for the specified architecture and destination.
• Updated .github/workflows/ci.yml and .github/workflows/package.yml to run the new script, set the DAGENT_MULTI_PWSH_EXECUTABLE environment variable, and ensure the executable is available during packaging. [1] [2] [3] [4] [5]

Documentation updates:

• Updated .agents/skills/build-agent-msi/SKILL.md to include the new step for downloading multi-pwsh and to document the new environment variable. [1] [2]

MSI packaging changes:

• Modified package/AgentWindowsManaged/Program.cs to resolve and include the multi-pwsh.exe binary as part of the agent MSI package. [1] [2]

[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

Bundles multi-pwsh with Windows Agent MSI packages.

Changes:

• Adds architecture-specific multi-pwsh downloading.
• Integrates the executable into CI and release packaging.
• Documents local MSI build setup.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.agents/skills/build-agent-msi/SKILL.md	Documents download and environment setup.
.github/workflows/ci.yml	Downloads multi-pwsh for Windows builds.
.github/workflows/package.yml	Supplies it during release packaging.
ci/download-multi-pwsh.ps1	Downloads and extracts release assets.
package/AgentWindowsManaged/Program.cs	Includes the executable in the MSI.

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