Thanks Karan, glad it was useful!
I don't have a step by step guide as such. I largely followed this documentation, replacing the use of CodeCommit with GitHub and the node app with my .NET app.
You can see the buildspec.yml and template.yml in the repository. You'll need to replace any values according to your AWS S3 Bucket name and Secrets Manager ARN (if you use that).
I'll might write a blog post with a guide of how to do this.
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