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Or put it in a microvm using eg smolmachines.

I've never used smolmachines but I'm curious; why this over a container?

Containers are not security boundaries. Vulnerabilities in containers are much more common than in VMs.

Kernel-level isolation is a significant security differentiator, for starters.

shows a good comparison table.

Using runsc instead of runsc means that there's a hypervisor layer (gvisor, probably) in-between the kernel and the container userland