Implement hoster vm deploy --from-docker-compose flag

[yaroslav-gwit]

hoster vm deploy --from-docker-compose /root/nextcloud/docker-compose.yaml will help you start any docker workload in seconds on top of a Debian Stable VM (FreeBSD doesn't natively support docker).

Here is outline of the process behind the scenes:

• manually download (and edit if needed) docker-compose.yaml file to the local file system on Hoster node itself
• execute hoster vm deploy --from-docker-compose /root/nextcloud/docker-compose.yaml, pointing to your local docker-compose.yaml file
• Hoster will deploy a custom VM, based on top of Debian Stable, with docker and docker-compose pre-installed
• Hoster will mount a folder within the VM itself, using VirtIO 9P
• docker-compose.yaml file will be copied into that folder
• VM will execute that docker-compose.yaml on the first boot
• docker-compose up will be executed within a tmux session, so you can SSH into the VM and check what happened in the background using tmux -a
• docker-compose.yaml will be copied to /root/hoster-docker-compose/docker-compose.yaml

P.S. try keeping all your docker volumes in ./ for maximum data locality, so in case you'd need to migrate your docker-compose deployment to a newer VM version (or another host) it will be very easy to do.