Run tests in pipeline

[simontesar]

Tests should run in a GitHub actions workflow

[simontesar]

GitHub Actions runners don't support nested virtualisation, needs to be fixed in metal-lab: simontesar/metal-lab#22

[simontesar]

Tests are obviously slow in userspace TCG, consider:

• implementing a way to disable node2 to save resources
• parameterise resources of the VMs

[simontesar]

Testing in #34