Please confirm it I'm understanding you correctly.
You are trying to use the .net core SDK 3.0 in Pipelines, but the default docker image (that is used when no other is referenced) does not have the version you need, right?
If this is the case, can you reference a different image that has the SDK you need?
Another option is to customize any image as you want. Then you can reference it in your Pipelines.
More details on how to reverence other images can be found at:
I hope that is helpful.
# This is a sample build configuration for .NET Core.
# Check our guides at https://confluence.atlassian.com/x/5Q4SMw for more examples.
# Only use spaces to indent your .yml configuration.
# You can specify a custom docker image from Docker Hub as your build environment.
script: # Modify the comma`nds below to build your repository.
#the following lines are irrelevant.
IMO the bold line should be replaced in your situtation. Just try 3.1 at the end and see if anything happens.
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