Move insertion PR tagger pipeline

[JoeRobich]

This is the last of the roslyn-tools code that was still active. We can move our pipeline over to this yml once merged and archive dotnet/roslyn-tools repo.

Microsoft Reviewers: Open in CodeFlow

[azure-pipelines]

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[Copilot]

Pull request overview

This PR adds a dedicated Azure Pipelines YAML for the insertion PR tagger so the remaining active automation can live in dotnet/roslyn, enabling eventual archival of dotnet/roslyn-tools.

Changes:

• Added a new scheduled pipeline (eng/pipelines/insertion-pr-tagger.yml) that runs pr-tagger via dnx using WIF-acquired Azure DevOps tokens plus a configured GitHub PAT.
• Updated the repository file map documentation to point contributors to eng/pipelines/ for pipeline definitions/templates.

Show a summary per file

File	Description
eng/pipelines/insertion-pr-tagger.yml	Introduces the scheduled PR tagger pipeline using 1ES templates, UseDotNet, and AzureCLI.
.github/memory/FILE_MAP.md	Documents that pipeline definitions/templates live under eng/pipelines/.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Lite

[Copilot]

Review details

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

eng/pipelines/insertion-pr-tagger.yml:75

• The inline script invokes pr-tagger without --ci (so interactive AzDO auth fallback can be enabled) and depends on dnx being available on the agent. For CI reliability, pass --ci and run the tool via dotnet tool install (similar to eng/pipelines/insert.yml) so the pipeline is self-contained and won’t hang if tokens are invalid/expired.

              $arguments = @(
                "Microsoft.RoslynTools"
                "--prerelease"
                "--add-source", "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json"
                "--"

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Lite

[Copilot]

Review details

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

eng/pipelines/insertion-pr-tagger.yml:76

• The script invokes dnx to run Microsoft.RoslynTools, but this pipeline never installs/bootstraps dnx. That makes the job depend on whatever happens to be preinstalled on the agent image/1ES template and can break when images change. Consider invoking the tool via dotnet tool install (as documented for Microsoft.RoslynTools) and run the installed roslyn-tools shim directly.

                "--dnceng-azdo-token", $azdoToken
                "--ci"
              )

              & dnx @arguments

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Lite