* dotnet/release/2.1.5xx:
MSBuild 15.9.8-preview
MSBuild SDK Resolver Improvements (#9547)
Remove fallback folder
Remove redundent call, ensure no apt list
Update links in the readme to release/2.1.5xx
MSBuild 15.9.0-preview-000006
Use prebuild image
Revert "Disabled MSBuildTreatWarningsAsErrors"
Disabled MSBuildTreatWarningsAsErrors
Add back: "PUBLISH_NUPKG_TO_BLOB_FEED" to manage the no-suffix builds in 2.1
Adding the 2.1.3 runtime blob feed as a feed for the CLI
Update CLI branding to 2.1.402
Updated test
TestPlatform 15.9.0-preview Insertion
Update CLI branding to 2.1.203.
Fix warnings-as-errors in Linux packaging
Don't let crossgen warnings become msbuild warnings-as-errors
Fix build warning and treat msbuild warnings as errors
Conflicts:
README.md
build/DependencyVersions.props
build/package/Installer.DEB.proj
057098046f