provision-nixos-server

Provision new NixOS servers on Hetzner for this nix flake project. Guides through the complete workflow: server creation, SSH setup, Colmena configuration (init/full pattern), and application deployment with nginx proxy, PostgreSQL, and container images. Use when: (1) Setting up a new Hetzner server, (2) Setting up a new NixOS host with Colmena, (3) Deploying applications with nginx SSL proxy and/or PostgreSQL database, (4) Adding new container images to the repository.