How to deploy the .NET Core 3.1 application?

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Hi there
In my CD/CI I use default runners (14 are available) and deploy to docker container. I created the Dockerfile and its first declaration is:

Define base image

FROM microsoft/dotnet:3.1-sdk AS build-env

It throws the exception:

Step 1/11 : FROM microsoft/dotnet:3.1-sdk AS build-env
109 manifest for microsoft/dotnet:3.1-sdk not found: manifest unknown: manifest unknown

How to fix it?
Thanks.