How to publish environment specific appsettings in .Net core app?

Question

I have 3 environment specific appsettings files in my .Net core application

in project.json I have setup publishOptions

Answer 1

In VS2017 Adding multiple environment

steps right click project --> Add --> NewItem - select json file - write file name as 'appsettings.staging.json' or 'appsettings.production.json'

Add appsettings.staging.json file

Output Looks like