feat: add kubectl support

[andrewb1269]

Add KubeCtl Support.

Closes #103

[Copilot]

Pull request overview

Adds optional kubectl installation support to the composite “initialize job” action, matching the requested setup snippet in Issue #103.

Changes:

• Document setup-kubectl / kubectl-version inputs in the README.
• Add setup-kubectl / kubectl-version inputs and an install step using step-security/setup-kubectl.
• Extend CI workflow coverage to exercise default and custom kubectl versions.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
README.md	Documents new kubectl inputs and adds it to the supported build tools list.
action.yml	Adds new inputs and installs kubectl conditionally via step-security/setup-kubectl.
.github/workflows/test.yml	Adds verification and dedicated jobs to test kubectl setup (default + custom version).

Suppressed comments (2)

action.yml:673

• The log group label uses "KubeCtl" casing, which is inconsistent with the tool name kubectl. This makes log groups harder to search for across workflows.

        echo "::group::Setting up KubeCtl"

action.yml:677

• The step name uses "KubeCtl" casing; consider using kubectl to match the binary name and README section title.

    - name: Install KubeCtl

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