build checks.x86_64-linux.forwardCompatibility

Reproduce this run
  1. 0.22 s $ /nix/store/9ypz3flqsrl5xl495mm8h645gadjsxi1-coreutils-9.11/bin/timeout --kill-after=15s 7200s /nix/store/23zk8sgzamrbmj1fday15szf7f2279s8-nix-2.34.7/bin/nix --extra-experimental-features nix-command --extra-experimental-features flakes --log-format internal-json build --no-link --print-out-paths git+https://github.com/NorfairKing/sydtest?ref=master&rev=ee3784cce65c281dac8b5b771a421d9b102c4cb7#checks.x86_64-linux.forwardCompatibility --print-build-logs
  2. 0.27 s warning: ignoring untrusted flake configuration setting 'extra-substituters'.
  3. 0.27 s Pass '--accept-flake-config' to trust it
  4. 0.27 s warning: ignoring untrusted flake configuration setting 'extra-trusted-public-keys'.
  5. 0.27 s Pass '--accept-flake-config' to trust it
  6. 0.30 s
  7. 0.74 s /nix/store/lsgf9ii5k5cksp64j83k4g5hpw6a2ycr-sydtest-release-without-mutation
  8. 0.75 s Build succeeded.