ci(e2e): add support for kvm-e2e tests

fix: import nixpkgs properly

test(e2e): add kvm and nixos-test features

feat(e2e): run arion inside kvm

feat(e2e): enable docker virtualization

feat(e2e): switch to podman

feat(e2e): use name instead of project.name

e2e: pass in devnet instead of spec

remove networks.union-devnet from devnet

e2e: unnest project

cleanup

rename project to network

pls ci

pls ci

pls ci