refactor(core): add binaries, remove unnecessary, change build images

[universal-itengineer]

Description

This PR refactors container images to improve security and efficiency. Changes impact the following components:

• bounder
• cdi-artifact
• cdi-cloner
• cdi-importer
• dvcr-artifact
• virt-artifact
• virt-handler
• virt-launcher
• virt-operator

Key changes:

1. Shell removal: Replaced bash/sh dependencies with statically compiled binaries (e.g., temp_pod), eliminating shell-based commands like echo.
2. KubeVirt patches:
   • 041-rename-node-labeller-virt-launcher-init.patch: Replace "/bin/sh","-c","node-labeller" to "node-labeller"
   • 045-virt-launcher-image-holder-command-sleep.patch: Simplified virt-launcher-image-holder command from sh -c "sleep infinity" to sleep infinity.
   • 046-hotplug-attachment-trigger-pod-remove-bash.patch: Replaced shell invocations in init containers with direct binary execution.
   • 047-node-labeller-replace-sysctl-command-with-readfile.patch: replacing linux util sysctl to os.ReadFile("/proc/sys/kernel/sched_rt_runtime_us") in virt-handler
3. Test fixes: Updated vmi_test.go assertions to align with new command syntax (e.g., Equal("temp_pod")).
4. virt-launcher enhancements:
   • Fixed library inclusion steps in the image build process.

Why do we need it, and what problem does it solve?

• Reduces attack surface by removing unnecessary shell utilities from production images.
• Aligns with security best practices for Kubernetes workloads.
• Improves resource efficiency by eliminating shell interpreter overhead.

Problem Solved

• Shell dependency risks: Previous use of bash/sh introduced potential security vulnerabilities and increased image size.
• Fragile command syntax: Shell-based commands (sh -c "...") complicated maintenance and auditing

What is the expected result?

• Secure images: Minimalist containers with no shell access, adhering to compliance standards.
• Stable operations: Direct binary execution avoids shell-related failures.
• Improved maintainability: Simplified command syntax reduces technical debt.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: core
type: chore
summary:  refactor build core components, shell removal
impact_level: low