these 6 derivations will be built:
  /nix/store/znfyvgcw02bbsdjyskbj641aj628h913-libguestfs-1.56.2.drv
  /nix/store/5d284xrsa8mp0gwhg7zq8kncnckjmp2a-guestfs-tools-1.52.3.drv
  /nix/store/q5w61raiz1v2wm63p56qhqlrwha6yjrk-ubuntu-26.04-server-cloudimg-amd64v3.img-nix-vm-test.qcow2.drv
  /nix/store/40k5q2019bv4gqxjkwli6sdx0qdpqz4c-run-vm-vm.drv
  /nix/store/p3bsfrbnvy99dxhgad9h1zvvgdg8ginh-driver-configuration.json.drv
  /nix/store/iphvj8mfx189k26alxgdibxl0kjmy9nw-test-driver.drv
building '/nix/store/p3bsfrbnvy99dxhgad9h1zvvgdg8ginh-driver-configuration.json.drv'
driver-configuration.json> structuredAttrs is enabled
building '/nix/store/iphvj8mfx189k26alxgdibxl0kjmy9nw-test-driver.drv'
test-driver> structuredAttrs is enabled

upload niks3: ok