build packages.x86_64-linux.default

Reproduce this run
  1. 0.13 s $ /nix/store/vzx1mi9c0xfadmsm9dhd83d005cb1qs9-coreutils-9.8/bin/timeout --kill-after=15s 7200s /nix/store/86n4l5yri6hys3zk2mwy2azcv9prqb8j-nix-2.31.4/bin/nix --extra-experimental-features nix-command --extra-experimental-features flakes --log-format internal-json build --no-link git+https://github.com/NorfairKing/upcheck?ref=master&rev=2fd6de9e26419990d87b5763ad36d10fcf396ab3#packages.x86_64-linux.default --print-build-logs
  2. 0.15 s warning: ignoring untrusted flake configuration setting 'extra-substituters'.
  3. 0.15 s Pass '--accept-flake-config' to trust it
  4. 0.15 s warning: ignoring untrusted flake configuration setting 'extra-trusted-public-keys'.
  5. 0.15 s Pass '--accept-flake-config' to trust it
  6. 0.15 s
  7. 0.29 s Downloading cached upcheck from https://cache.staging.nix-ci.com
  8. 0.42 s Progress: 0 of 1 built, 1 of 1 downloaded from cache