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Yes you would just write your pulumi program to output the information that you need and use <https://www.pulumi.com/docs/reference/cli/pulumi_stack_output/|pulumi stack output> to fetch it after the deployment

You can actually use the GitHub provider and set the GitHub secret directly from your Pulumi program 

<https://www.pulumi.com/registry/packages/github/api-docs/actionssecret/>

This is a good all around C# example with automation api <https://github.com/gitfool/Pulumi.Dungeon|https://github.com/gitfool/Pulumi.Dungeon>