Impossible to edit an empty Github repository

await fetch("https://api.github.com/repos/manuelleduc/cristaledittestpublic/contents/aaa.md", {
    "credentials": "omit",
    "headers": {
        "User-Agent": "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:141.0) Gecko/20100101 Firefox/141.0",
        "Accept": "*/*",
        "Accept-Language": "en-US,en;q=0.5",
        "Content-Type": "application/vnd.github+json",
        "Sec-GPC": "1",
        "Sec-Fetch-Dest": "empty",
        "Sec-Fetch-Mode": "cors",
        "Sec-Fetch-Site": "cross-site",
        "Priority": "u=4",
        "Pragma": "no-cache",
        "Cache-Control": "no-cache"
    },
    "body": "{\"content\":\"LS0tCm5hbWU6IGFhYQpzeW50YXg6IG1hcmtkb3duLzEuMgotLS0K\",\"message\":\"Update aaa\"}",
    "method": "PUT",
    "mode": "cors"
});

{
  "message": "Not Found",
  "documentation_url": "https://docs.github.com/rest/repos/contents#create-or-update-file-contents",
  "status": "404"
}