Added hetzner server configs

servers/hetzner/modules/services/mailserver.nix

@@ -0,0 +1,46 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  virtualisation.oci-containers.containers.mailserver = {
+    image = "ghcr.io/docker-mailserver/docker-mailserver:latest";
+    autoStart = true;
+    hostname = "mail.severijnse.eu";
+    ports = [
+      "25:25"
+      "[::]:25:25"
+      "143:143"
+      "[::]:143:143"
+      "465:465"
+      "[::]:465:465"
+      "587:587"
+      "[::]:587:587"
+      "993:993"
+      "[::]:993:993"
+    ];
+    volumes = [
+      "/home/admin/dms/mail-data/:/var/mail/:Z"
+      "/home/admin/dms/mail-state/:/var/mail-state/:Z"
+      "/home/admin/dms/mail-logs/:/var/log/mail/:Z"
+      "/home/admin/dms/config/:/tmp/docker-mailserver/:Z"
+      "/etc/localtime:/etc/localtime:ro"
+      # On the running Debian, Caddy v2 stores certs at /home/admin/caddy/data/caddy/certificates/...
+      # On NixOS, Caddy stores certs at /var/lib/caddy/certificates/...
+      "/var/lib/caddy/certificates/acme-v02.api.letsencrypt.org-directory/mail.severijnse.eu/:/etc/letsencrypt/live/mail.severijnse.eu/:ro"
+    ];
+    environment = {
+      OVERRIDE_HOSTNAME = "";
+      LOG_LEVEL = "info";
+      SPOOF_PROTECTION = "1";
+      MOVE_SPAM_TO_JUNK = "1";
+    };
+    environmentFiles = ["/home/admin/mailserver.env"];
+    extraOptions = [
+      "--label=com.centurylinklabs.watchtower.enable=true"
+      "--dns=1.1.1.1"
+      "--dns=8.8.8.8"
+    ];
+  };
+}