@nirs nirs left a comment

- Fix Makefile title in aarch64
- Unify whitespaec in *.mk files
- Remove extra space between the hash and the tarball name
- Remove empty line at the end hash file

Based on crictl-bin Config.in.

Containerd supports a simple and poorly documented drop-in configuration
files using the imports option. If this option is set:
 imports = ["/etc/containerd/conf.d/*.toml"]
Then toml files under /etc/containerd/conf.d/ are loaded and merged with
the config read from /etc/containerd/config.toml.
Unlike systemd drop-in files, you cannot override single option by
adding drop-in configuration file. To override a single option you must
set all options in the section, and the entire section is replaced by
the drop-in file.
We never used this feature since our config contains:
 # imports
And we don't configure this dynamically. Our config on the host is:
 $ grep conf.d /etc/containerd/config.toml
 conf_dir = "/etc/cni/net.d"
However we were creating:
 /etc/containerd/containerd.conf.d/
This path does not make sense (repeating containerd twice) and files in
this directory are ignored.
Finally this directory was created in CONFIGURE_CMDS instead of
INSTALL_CMDS. Now that we install a binary we should not have any
configure commands.
Since we never had a working conf.d directory we can safely remove it.

This is the reason for the strange failure when build the x86_64 iso,
about no hash for arm64 tarball. I seems that package for different
architectures must have a different names to avoid confusing buildroot.
The name was broken by mistake when updating to containerd 2.1.4.
With this change iso build works for both aarch64 and x86_64.

For containerd 2.1.4, the recommended nerdctl version is 2.1.3 or higher.
Here's why this is the recommended version and where you can find it:
- Version alignment: Major releases of containerd are often paired with
 a corresponding nerdctl release to ensure compatibility with new
 features and breaking changes. nerdctl 2.1.x is specifically developed
 and tested for the containerd 2.1.x release cycle.
- Release verification: The official nerdctl release page on GitHub
 explicitly states the intended compatibility. For instance, the
 release notes for nerdctl 2.1.3 confirm it is expected to be used with
 containerd 2.1.
- Feature support: nerdctl 2.1.x includes updates that support the
 latest features and architectural changes in containerd 2.1, such as
 UserNS-Remap mode.
(From Google AI Mode)
Generated using:
 make update-nerdctl-version
and removing the kicbase change, since nerdctl 2.1.3 does not work with
containerd 1.7 consumed from Ubuntu. It will be updated when we switch
to newer version of Ubuntu or Debian.