Build VM image for Yandex Compute Cloud

This directory contains scripts and configuration for preparing a VM image that will be deployed as Yandex Compute instance later.

Overview

make bucket will create an S3 bucket in Yandex Object Storage (uses Terraform under the hood; make destroy will destroy the bucket if it's empty)
make image will build the VM image using following steps (requires root):
- Download latest Debian Official Cloud image
- Use qemu-utils to convert image to raw format and to grow root partition
- Execute template/prepare.sh in systemd-nspawn container. Heavy lifting is delegated then to Ansible
- Use qemu-utils again to compress resulting image back to qcow2
make upload will upload the image to S3 bucket using awscli

This VM image is continuously delivered to pre-existing S3 bucket using GitHub Actions (see .github/workflows/server.yml)