Loading
nixosTests.acme: Use a read-only pkgs
This speeds up evaluation by a factor 2. Ballpark figures from my machine: ``` $ time nix-build nixos/release.nix -A tests.acme /nix/store/q4fxp55k64clcarsx8xc8f6s10szlfvz-vm-test-run-acme /nix/store/lnfqg051sxx05hclva84bcbnjfc71c8x-vm-test-run-acme real 1m28.142s user 1m7.474s sys 0m7.932s $ time nix-build nixos/release.nix -A tests.acme /nix/store/q4fxp55k64clcarsx8xc8f6s10szlfvz-vm-test-run-acme /nix/store/lnfqg051sxx05hclva84bcbnjfc71c8x-vm-test-run-acme real 0m38.235s user 0m33.814s sys 0m2.283s ```