zelm-custom-package-repository-config.json

{
    "repositories": [
        {
            "type": "elm-package-server",
            "url": "https://package.elm-lang.org/"
        },
        {
            "type": "elm-package-server",
            "url": "https://package.zelm-lang.org/"
        }
    ],
    "single-package-locations": [
        {
            "file-type": "tarball",
            "package-name": "zelm/html",
            "version": "1.0.2",
            "url": "https://www.example.com/zelm/html/package.tar"
        },
        {
            "file-type": "zipfile",
            "package-name": "zelm/html",
            "version": "1.0.3",
            "url": "https://www.example.com/zelm/html/package.zip"
        }
    ]
}