install MinIO in a VM

Setup a new virtual machine in the gnt-dal cluster with 1TB of SSD-backed storage, running MinIO in "single node" mode.

This should get the container registry running (gitlab#89 (closed)) without running out of disk space, but also provide us with a generic object storage system that could be used for other GitLab components.

More discussion and specifications in #40478 (closed), this is also part of scaling up GitLab in general (#40479).

launch checklist:

• install VM
• install MinIO
• testing
• backups we're sticking with the ad-hoc solution for now.
• auto-upgrades
• monitoring
• documentation
• security: review checklist https://min.io/docs/minio/container/operations/checklists/security.html
• run as a normal user (with podman --user, not systemd User=!)
• test --network=host to fix #41259