Enhance NuGet feed selection to support pre-release packages

[Chris Blank (ChrisBlankDe)]

❔What, Why & How

This pull request adds support for including pre-release versions of Business Central app packages from NuGet feeds by enhancing the nuGetFeedSelectMode setting. Now, appending -allowPrerelease to the select mode enables searching for pre-release packages. The documentation and pipeline logic have been updated to reflect and support this new capability.

NuGet pre-release support:

• Updated the documentation for the nuGetFeedSelectMode setting in Scenarios/settings.md to explain that adding -allowPrerelease as a suffix will include pre-release packages in dependency resolution.
• Modified the pipeline logic in RunPipeline.ps1 to extract the -allowPrerelease flag from nuGetFeedSelectMode, pass a new allowPrerelease parameter, and clean up the select mode value accordingly.

Release notes:

• Added a section to RELEASENOTES.md describing the new support for pre-release NuGet packages and how to enable it using the -allowPrerelease suffix.

This change requires microsoft/navcontainerhelper#4206.
Related to issue: #2315

✅ Checklist

• Add tests (E2E, unit tests)
• Update RELEASENOTES.md
• Update documentation (e.g. for new settings or scenarios)
• Add telemetry

[Copilot]

🟡 Changes recommended

The implementation breaks on supported PowerShell 5 and lacks corresponding schema and behavioral test updates.

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Pull request overview

Adds opt-in pre-release NuGet dependency resolution through a -allowPrerelease selection-mode suffix.

Changes:

• Parses and forwards the pre-release option.
• Documents configuration and release behavior.
• Depends on navcontainerhelper PR #4206.

File summaries

File	Description
Actions/RunPipeline/RunPipeline.ps1	Parses and forwards pre-release selection.
Scenarios/settings.md	Documents the suffix.
RELEASENOTES.md	Announces the feature.

Review details

Suppressed comments (1)

Actions/RunPipeline/RunPipeline.ps1:410

• There is no behavioral test for this new parsing/forwarding path; Tests/RunPipeline.Action.Test.ps1 currently only compiles the action and checks its manifest. Add unit coverage that executes the captured InstallMissingDependencies scriptblock and verifies normal and case-insensitive suffixed modes, including select stripping and allowPrerelease forwarding to both publish and download branches. This would also catch runtime-specific API incompatibilities.

                        "select" = $settings.nuGetFeedSelectMode.Replace("-allowPrerelease", "", [System.StringComparison]::OrdinalIgnoreCase)
                        "allowPrerelease" = $settings.nuGetFeedSelectMode.EndsWith("-allowPrerelease",[System.StringComparison]::OrdinalIgnoreCase)

• Files reviewed: 3/3 changed files
• Comments generated: 2
• Review effort level: Balanced (auto)

Note

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[Freddy Kristiansen (freddydk)]

I have implemented the same feature for a customer, who also needs this.
I went with another setting beside the selectMode called allowPrerelease - but maybe combining them is a better idea actually.
I'm OK with both.