Consider adding a shipping package baseline test

[HaoK]

As part of the postmortem for a 5.0.1 issue where we needed to mark Identity.Specficiation.Tests as shipping. It seems worth adding a test with baselines to track the total set of packages we ship, similar to how we track the list of assemblies in the shared fx here: https://github.com/dotnet/aspnetcore/blob/master/src/Framework/test/TestData.cs.

The analogy would be something that just enumerates all the nupkgs in the shipping artifacts and fails if there's a mismatch from the list so we can track/be explicitly intentional about changes in the packages we ship.

[ghost]

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[JunTaoLuo]

Post-build hook in arcade would be useful in creating a check for this. https://github.com/dotnet/aspnetcore/blob/master/eng/AfterSolutionBuild.targets

[dougbu]

I'm not sure what would be needed here nor how additional automation would help. If we need to check prior to the release, manifest files e.g. \vsufile\patches\sign\NET\CORE_BUILDS\2.1.X\2.1.31\20210916-02\assets\orchestration-metadata\manifests\aspnet.xml, \vsufile\patches\sign\NET\CORE_BUILDS\3.1.X\3.1.20\3.1.120-servicing-015384\manifest.json, or \vsufile\patches\sign\NET\NET_CORE\5.0.11\configs\manifests\manifest.json are available when internal builds are announced.

Looking back, the eng/Baseline.xml file e.g. https://github.com/dotnet/aspnetcore/blob/release/2.1/eng/Baseline.xml and (for 2.1) https://github.com/dotnet/versions/blob/main/build-info/dotnet/product/cli/release/2.1/build.xml and similar files are available after every release.

/cc @mkArtakMSFT because this relates to validating fixes are in a release

[dougbu]

/btw John's suggestion won't help because we always ship everything in every release, with the minor exception of targeting packs. Where we do incremental shipment (in release/2.1), Arcade isn't involved.

[dougbu]

In any case, I have no way to know when we'd do this, if do something, and cleared the milestone for now. Suggestions for "maybe" items @adityamandaleeka @rafikiassumani-msft @mkArtakMSFT @Pilchie❔