If you want to do add the repository manually, please follow the procedure highlighted in the Home Assistant website. Use the following URL to add this repository: https://github.com/GollumDom/addon-repository
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Navigate in your Home Assistant frontend to Supervisor -> Add-on Store.
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Click the 3-dots menu at upper right ... > Repositories and add this repository's URL: https://github.com/GollumDom/addon-repository