Add distroless backlink to ubuntu-chiseled documentation

[lbussell]

No description provided.

[lbussell]

Build issue appears to be transient, related to NuGet.org cert validation.

   Package 'runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl 4.3.0' from source 'https://api.nuget.org/v3/index.json':   Subject Name: CN=NuGet.org Repository by Microsoft, O=NuGet.org Repository by Microsoft, L=Redmond, S=Washington, C=US
   Package 'runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl 4.3.0' from source 'https://api.nuget.org/v3/index.json':   SHA256 hash: 0E5F38F57DC1BCC806D8494F4F90FBCEDD988B46760709CBEEC6F4219AA6157D
   Package 'runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl 4.3.0' from source 'https://api.nuget.org/v3/index.json':   Valid from: 4/10/2018 12:00:00 AM to 4/14/2021 12:00:00 PM
 C:\source\tests\app.csproj : error NU3037: Package 'runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl 4.3.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature validity period has expired.
 C:\source\tests\app.csproj : error NU3028: Package 'runtime.opensuse.42.1-x64.runtime.native.System.Security.Cryptography.OpenSsl 4.3.0' from source 'https://api.nuget.org/v3/index.json': The repository primary signature's timestamping certificate is not trusted by the trust provider.

Not related to the changes here, so I'll merge around it.