RHEL10用のDocker公式リポジトリまだないみたいだね

$ sudo dnf upgrade -y
AlmaLinux 10 - AppStream                                                                                                                                                                                                     3.2 MB/s | 5.5 MB     00:01    
AlmaLinux 10 - BaseOS                                                                                                                                                                                                        1.6 MB/s | 2.3 MB     00:01    
AlmaLinux 10 - Extras                                                                                                                                                                                                         17 kB/s |  12 kB     00:00    
Docker CE Stable - x86_64                                                                                                                                                                                                    390  B/s | 382  B     00:00    
Errors during downloading metadata for repository 'docker-ce-stable':
  - Status code: 404 for https://download.docker.com/linux/rhel/10/x86_64/stable/repodata/repomd.xml (IP: 2600:9000:26a6:c000:3:db06:4200:93a1)
Error: Failed to download metadata for repo 'docker-ce-stable': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

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