Add SourceLink opt-out for sandbox builds

[Copilot]

Builds in Copilot sandboxes can fail when SourceLink cannot access repository metadata. This adds an opt-in environment switch for those environments while preserving default SourceLink behavior.

• Build configuration
  • Added ARK_DISABLE_SOURCELINK=true handling to repository and sample Directory.Build.props files.
  • Disables EnableSourceLink and EnableSourceControlManagerQueries when enabled.

ARK_DISABLE_SOURCELINK=true dotnet build

[AndreaCuneo]

the msbuild should detect being in a sandbox. look for some env Variable that identify this env as a Sandbox.

the PR as is it is useless as was already possible to pass EnableSourceLink=false in a -p: parameter on dotnet build. The task is to find a detection point.

@copilot

[Copilot]

the msbuild should detect being in a sandbox. look for some env Variable that identify this env as a Sandbox.

the PR as is it is useless as was already possible to pass EnableSourceLink=false in a -p...

Implemented automatic detection using the Copilot sandbox's COPILOT_AGENT_ACTION environment variable. SourceLink is now disabled automatically in Copilot agent builds and remains unchanged elsewhere. Commit: 23b40fa.

[Copilot]

Pull request overview

Adds a build-time switch intended to disable SourceLink in Copilot sandbox environments where repository metadata is unavailable, to avoid build failures while keeping SourceLink enabled by default.

Changes:

• Introduces a SourceLink property group in repo and sample Directory.Build.props files.
• Disables EnableSourceLink and EnableSourceControlManagerQueries under a sandbox-detection condition.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
Directory.Build.props	Adds conditional disabling of SourceLink/SCM queries for sandbox-like environments.
samples/Ark.ResourceWatcher/Directory.Build.props	Mirrors the conditional SourceLink/SCM query disabling in this sample.
samples/Ark.ReferenceProject/Directory.Build.props	Mirrors the conditional SourceLink/SCM query disabling in this sample.
samples/Ark.MediatorFramework.Sample/Directory.Build.props	Mirrors the conditional SourceLink/SCM query disabling in this sample.

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