Breaking Change: .NET 9 Container Images No Longer Install zlib

[lbussell]

Breaking Change: .NET 9 Container Images No Longer Install zlib

As of .NET 9 Preview 7, the .NET runtime contains a statically-linked copy of zlib-ng. As a result, .NET 9 container images no longer install zlib, and will no longer update zlib in images where it is already installed.

For more information, please see:

• .NET 9 Preview 7 Announcement
• .NET 9 Preview 7 Libraries Release Notes
• Breaking changes in .NET 9
• Plan to migrate to zlib-ng (Plan to migrate to zlib-ng runtime#101465)
• zlib statically linked for .NET 9 (zlib statically linked for .NET 9; We need .NET 9-specific runtime-deps #5687)