Add support RHEL 10

[alexpts]

Need rmp repo for RHEL10 / Rocky Linux 10

[Ray0907]

Hit the same issue on RHEL 10.0 (Coughlan).

The docs explicitly list RHEL 10 as supported:
https://docs.docker.com/engine/install/rhel/#install-using-the-repository

However, the repo URL https://download.docker.com/linux/rhel/10.0/ returns 404, making both the standard install and the convenience script (get.docker.com) fail.

Workaround: After adding the repo, force it to use the RHEL 9 packages:

sudo sed -i 's/$releasever/9/g' /etc/yum.repos.d/docker-ce.repo
sudo dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

Working fine so far with Docker CE on RHEL 10.0.

[742764146]

这是一封自动回复邮件。已经收到您的来信，我会尽快回复。

[thaJeztah]

Cleaning up old tickets; packages for RHEL 10 should be available now https://download.docker.com/linux/rhel/10/

There's one issue remaining; for older distro versions we added redirects (e.g. 9.1 -> 9); for current RHEL versions that should no longer be needed if the .repo configuration uses $releasever_major instead of $releasever, but the repo files at download.docker.com do not yet use this, e.g. they currently use;

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/rhel/$releasever/$basearch/stable
enabled=1
gpgcheck=1
gpgkey=https://download.docker.com/linux/rhel/gpg

There's a pending PR to make the location of the .repo file itself depend on the version, but it requires some changes in our deploy pipeline;

• Move RHEL <10 .repo files to their own directory #524