Running docker build . produces
[5/5] RUN dotnet build:
#9 0.614 Microsoft (R) Build Engine version 16.9.0+57a23d249 for .NET
#9 0.614 Copyright (C) Microsoft Corporation. All rights reserved.
#9 0.614
#9 1.048 Determining projects to restore...
#9 4.722 Restored /app/functionnet5.csproj (in 3.45 sec).
#9 6.018 functionnet5 -> /app/bin/Debug/net5.0/functionnet5.dll
#9 6.253 Determining projects to restore...
#9 12.13 Restored /tmp/4m55zzag.rez/WorkerExtensions.csproj (in 5.84 sec).
#9 12.34 WorkerExtensions -> /tmp/4m55zzag.rez/buildout/Microsoft.Azure.Functions.Worker.Extensions.dll
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : It was not possible to find any compatible framework version [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : The framework 'Microsoft.NETCore.App', version '3.1.0' was not found. [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : - The following frameworks were found: [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : 5.0.4 at [/usr/share/dotnet/shared/Microsoft.NETCore.App] [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : You can resolve the problem by installing the specified framework and/or SDK. [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : The specified framework can be found at: [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=3.1.0&arch=x64&rid=debian.10-x64 [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39 /root/.nuget/packages/microsoft.net.sdk.functions/3.0.11/build/Microsoft.NET.Sdk.Functions.Build.targets(32,5): error : Metadata generation failed. [/tmp/4m55zzag.rez/WorkerExtensions.csproj]
#9 12.39
#9 12.39 Build FAILED.