'files in the root of a jekyll theme not copying over to where that theme is used

I have a jekyll theme (https://github.com/godalming123/matirlize-jekyll-theme) and I use it in (https://github.com/godalming123/blog) however in the jekyll theme I have a service worker located in the root of the theme with

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at the begining. However this ./sw.js file does not appear in the github pages site for https://github.com/godalming123/blog Help would be appreciated many thanks



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