fix(urunc-deploy): correctly parse containerd major version

[slash-init]

Description

The containerd runtime version parsing in urunc-deploy incorrectly extracts multiple version components from the runtime version string.
For example, containerd://2.3.4-k3s1.36 was parsed into multiple values, causing the version comparison to fail with [: too many arguments.
This change updates the version extraction to parse only the major containerd version following containerd://.

Related issues

• Fixes The containerd version detection in urunc-deploy does not parse correctly the version string #1071

How was this tested?

The version extraction was manually verified with the following runtime versions:

• containerd://2.3.4-k3s1.36 → 2
• containerd://1.7.20 → 1
• containerd://2.0.0 → 2
  The resulting version comparison was also verified for containerd 1.x and 2.x.
  Additionally:
• bash -n passed.
• git diff --check passed.
• No unrelated files were modified.

LLM usage

GPT 5.6 Lua was used to assist with investigating the issue.

Checklist

• I have read the [contribution guide](https://urunc.io/developer-guide/contribute/).
• The linter passes locally (make lint).
• The e2e tests of at least one tool pass locally (make test_ctr, make test_nerdctl, make test_docker, make test_crictl).
• If LLMs were used: I have read the [llm policy](https://urunc.io/developer-guide/llm-policy/).

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[cmainas]

Thank you @slash-init ,

can you add yourself in https://github.com/urunc-dev/urunc/blob/main/.github/contributors.yaml So we can merge this?

[slash-init]

Thank you @slash-init ,

can you add yourself in https://github.com/urunc-dev/urunc/blob/main/.github/contributors.yaml So we can merge this?

Done.

[cmainas]

Thank you @slash-init for the fix.