Running nancy in Azure DevOps requires bash to be present in the image

[mrooding]

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• What are you trying to do?

Run nancy's official docker image in an Azure DevOps pipeline

• How could we solve this issue? (Not knowing is okay!)

ADO requires that any container that you run as part of the pipeline have bash installed in the container. Do you want to add bash to be part of the original image? If not, I'll have to extend the image and maintain my own version

Thank you!

• Anything else?

cc @bhamail / @DarthHater