add scripts to install/uninstall kuasar-vmm

[Tweakzx]

add 3 scripts:

1. install kuasar, cloud-hypervisor and other components on x86_64 machines
2. build binaries of kuasar, containerd and virtiofsd, then install them and cloud-hypervisor for both x86_64 and aarch64 machines
3. uninstall kuasar and its relative components

[gemini-code-assist]

Summary of Changes

Hello @Tweakzx, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a comprehensive solution for managing the Kuasar VMM environment through two new shell scripts. The "install-kuasar-vmm.sh" script orchestrates the entire setup, from installing system dependencies to deploying Cloud-Hypervisor, Kuasar's VMM sandboxer, a specialized Containerd, crictl, and virtiofsd. Complementing this, the "uninstall-kuasar-vmm.sh" script provides a robust mechanism to cleanly remove these components and revert system configurations, enhancing the maintainability and ease of experimentation with Kuasar.

Highlights

• Installation Script: A new "install-kuasar-vmm.sh" script is added to automate the setup of Kuasar VMM, including Cloud-Hypervisor, a custom Containerd, crictl, and virtiofsd.
• Uninstallation Script: A corresponding "uninstall-kuasar-vmm.sh" script is introduced to safely remove all installed components and restore previous configurations for Containerd and crictl.
• Configuration Backup: Both scripts incorporate logic to back up existing "/etc/containerd/config.toml" and "/etc/crictl.yaml" files before applying Kuasar-specific configurations, ensuring a clean rollback path.

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[gemini-code-assist]

Code Review

This pull request introduces installation and uninstallation scripts for kuasar-vmm, which is a great step towards simplifying the user experience. My review focuses on improving the robustness, security, and cleanliness of these scripts. For the installation script, I've suggested using a temporary directory for downloads to ensure proper cleanup, adding checksum verification for security, quoting variables for robustness, and I've pointed out a brittle URL. For the uninstallation script, I've identified a missing file in the cleanup process, unused variables, and a misleading comment. Addressing these points will make the scripts more reliable and maintainable for users.

[hzxuzhonghu]

@Tweakzx Do you think we should also update readme or add a quickstart here https://kuasar.io/docs/

[Tweakzx]

@Tweakzx Do you think we should also update readme or add a quickstart here https://kuasar.io/docs/

These three scipts only install/configure/remove kuasar-vmm with cloud-hypervisor, not all runtimes and backends that kuasar supports. Maybe it's still in the early stages and not suitable to be seen as a quickstart guide yet.

[hzxuzhonghu]

Otherwise It's a little bit hard to know how to run these script

[Tweakzx]

Otherwise It's a little bit hard to know how to run these script

@hzxuzhonghu added a README file to describe how to run these scripts

[hzxuzhonghu]

After Post-Installation Steps, there should be a guide to use vmm. Can you link it to the existing guide

[hzxuzhonghu]

/lgtm

[kevin-wangzefeng]

/lgtm

[kevin-wangzefeng]

CI failue is irrelevant, manually merging.