Build & Deploy (Nix) / build-and-deploy (push) Failing after 7s
The Gitea Actions runner image (docker.gitea.com/runner-images:ubuntu-latest) does not have Nix pre-installed, causing 'nix: command not found' on the build step. Add an 'Install Nix' step using the Determinate Systems installer (--no-daemon mode since the runner runs in a container). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>