Add VM Factory image building pipeline with Packer and Ansible
Implement automated VM image building infrastructure using Packer for OpenStack with Ansible provisioning integration.
- Add Packer configuration for OpenStack VM image builds
- Integrate Ansible playbook for base image provisioning (git, vim)
- Configure GitLab CI pipeline with build_vm_image job
- Fix Packer SSH key conflict by removing PKR_VAR_root_ssh_key export
- Clean up OpenStack provider references and configuration