add feature: containerization

[aleeusgr]

We typically wrap our applications in a Docker image and deploy to some service that natively runs containers.

... can accept public traffic
... we have root access to via SSH

https://nixos.wiki/wiki/NixOS_Containers
https://nix.dev/tutorials/nixos/building-and-running-docker-images.html

[aleeusgr]

nixosConfigurations.container = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules =
        [ ({ pkgs, ... }: {
            boot.isContainer = true;

            # Let 'nixos-version --json' know about the Git revision
            # of this flake.
            system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;

            # Network configuration.
            networking.useDHCP = false;
            networking.firewall.allowedTCPPorts = [ 80 ];

            # Enable a web server.
            services.httpd = {
              enable = true;
              adminAddr = "[email protected]";
            };
          })
        ];
    };

nixos-container create <name> --flake .
nixos-container start <name>
nixos-container run <name> -- uname -a
nixos-container show-ip <name>

[aleeusgr]

error: syntax error, unexpected '=', expecting ';'

       at /nix/store/2yfdc4izlb4820w3l8sdyzjaimkssvmj-source/flake.nix:9:33:

            8|   outputs = { self, nixpkgs, utils, naersk }:
            9|   nixosConfigurations.container = nixpkgs.lib.nixosSystem {
             |                                 ^
           10|       system = "x86_64-linux";

[aleeusgr]

fixed in #17