Do not override content root with default

[halter73]

This fixes#78583 which is a regression between .NET 6 and .NET 7 where the impact is that ASPNETCORE_CONTENTROOT always gets ignored.

The issue was customer reported. There is a workaround of using the DOTNET_CONTENTROOT or even just CONTENTROOT environment variables instead, but the ASPNETCORE_ environment variable prefix is common. I plan to backport this for .NET 7 servicing.

This issue is caused by HostApplicationBuilder overriding the content root configuration passed in by ASP.NET Core's WebApplicationBuilder via HostApplicationBuilderSettings.Configuration with the CWD. This fix changes the HostApplicationBuilder to only configure the default content root to be CWD if it has not already been configured manually.

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Issue Details

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This fixes #78583 which is a regression between .NET 6 and .NET 7 where the impact is that ASPNETCORE_CONTENTROOT always gets ignored.

The issue was customer reported. There is a workaround of using the DOTNET_CONTENTROOT or even just CONTENTROOT environment variables instead, but the ASPNETCORE_ environment variable prefix is common. I plan to backport this for .NET 7 servicing.

This issue is caused by HostApplicationBuilder overriding the content root configuration passed in by ASP.NET Core's WebApplicationBuilder via HostApplicationBuilderSettings.Configuration with the CWD. This fix changes the HostApplicationBuilder to only configure the default content root to be CWD if it has not already been configured manually.

Author:	halter73
Assignees:	-
Labels:	area-Extensions-Hosting
Milestone:	-

[eerhardt]

LGTM. Sorry for the delay in approving.

[halter73]

/backport to release/7.0

[github-actions]

Started backporting to release/7.0: https://github.com/dotnet/runtime/actions/runs/3650905524