yum install gdisk failed

I tried to install gdisk and it failed:
[root@saphost01 ~] # yum install gdisk
Updating Subscription Management repositories.
Docker CE Stable - x86_64 568 B/s | 381 B 00:00
Errors during downloading metadata for repository 'docker-ce-stable':
- Status code: 404 for https://download.docker.com/linux/rhel/8/x86_64/stable/repodata/repomd.xml (IP: 52.222.149.7)
Error: Failed to download metadata for repo 'docker-ce-stable': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

The file https://download.docker.com/linux/rhel/8/x86_64/stable/repodata/repomd.xml apparently doesn't exist, the folder structure looks different.