The two integration tests in crates/coordinator/tests/ overlap completely
with the tryorama tests in tests/src/profile.test.ts -- both spin up a real
conductor, install profiles-test.dna, and exercise the same zome public
surface. nextest currently can't even compile against holochain 0.6.1's
dev-dep tree (iroh-relay -> curve25519-dalek 5.0.0-pre.1 needs the digest
crate's core-api feature, not unified by the resolver).

Keep cargo-nextest in flake.nix so it's available for manual runs once the
upstream feature-flag issue is fixed.