these 2 derivations will be built:
  /nix/store/cggw498z013fzxf4lflgabykdj9pg684-test-drv-canary-actual.drv
  /nix/store/djc3hkkr3g51aasxvg9bas9xhn2qd833-test-drv-canary.drv
building '/nix/store/cggw498z013fzxf4lflgabykdj9pg684-test-drv-canary-actual.drv'
building '/nix/store/djc3hkkr3g51aasxvg9bas9xhn2qd833-test-drv-canary.drv'

upload niks3: ok