Add containerd.runtime.extra_args configuration

[LoniasGR]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR adds the ability to configure containerd runtime options. Our main use case was to enable the cgroup_writable option, but I tried to generalize so that the rest of the options can be included. cgroups_writable specifically is also relevant for KEP 5474 and is needed for running specific kinds of workloads in Kubernetes (in our case it was FreeIPA).

Example of usage:

containerd_runc_runtime:
  name: runc
  type: "io.containerd.runc.v2"
  base_runtime_spec: cri-base.json
  extra_args:
    cgroup_writable: true
  options:
    Root: ""
    SystemdCgroup: "{{ containerd_use_systemd_cgroup | ternary('true', 'false') }}"
    BinaryName: "{{ bin_dir }}/runc"

Which issue(s) this PR fixes:

Did not find any relevant issues.

Special notes for your reviewer:

• The name could be changed, I just couldn't think of a better one, however I could see confusion arising between this and containerd_extra_runtime_args.
• I'm not sure if this should be also added to the containerd v.1 template.

Does this PR introduce a user-facing change?:

containerd runtime options can be configured under  `runtime.extra_args`

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: LoniasGR / name: Leonidas Avdelas (5c12701)

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[kubernetes-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: LoniasGR
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[Copilot]

Pull request overview

This PR extends Kubespray’s containerd (v2+ CRI) config.toml template to support injecting additional per-runtime configuration fields (beyond runtime_type, base_runtime_spec, and .options) via a new runtime.extra_args mapping.

Changes:

• Add runtime.extra_args rendering into config.toml.j2 under each [...runtimes.<name>] stanza.
• Support string/boolean/non-string values when rendering runtime.extra_args entries.

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[LoniasGR]

The same code block is used in lines 43-51 to detect the variable type, so i'm not sure these two should differ.

[yankay]

/ok-to-test