Crazy example, but this is my Simple-Bookmark app. You can see the taskfile.yaml files that do all the build steps, including the container package. 

https://github.com/VnUgE/Simple-Bookmark/tree/master/ci

And then magically, the output is put into my S3 server available for download on my site. lol
https://www.vaughnnugent.com/Resources/Software/Modules/Simple-Bookmark