Harden server and add Nix-native CI + self-hosted Gitea Actions

- caddy: security headers (X-Content-Type-Options/X-XSS-Protection/
  X-Frame-Options) on all vhosts + baseline CSP; strip SnappyMail
  upstream copies via header_down on mail.severijnse.eu
- tlsa-updater: compute TLSA 3 1 1 from cert SPKI (SHA-256), sync
  _25/_465/_993, fail-safe placeholders; coredns zone updated
- pre-commit: wire cachix/git-hooks.nix (alejandra, statix, actionlint,
  ...); CI pre-commit job over x86_64 + aarch64 matrix
- gitea: enable Gitea Actions + self-hosted runner (native:host,
  aarch64 via binfmt); add .gitea/workflows/ci.yml and local hook
- fix statix warnings (merge repeated systemd/database/configFile keys,
  inherit, bool-compare guards); add missing trailing newlines

servers/hetzner/modules/security/acme.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   # NOTE: Caddy handles all TLS natively via its ACME integration.
   # This module is kept as a fallback for non-Caddy services.
   # Currently NOT imported in default.nix — uncomment there to activate.

servers/hetzner/modules/services/backup.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: let
+{pkgs, ...}: let
   backupScript = pkgs.writeShellScript "weekly-backup" ''
     BACKUP_DIR="/home/admin/backups"
     SRC="/home/admin"

servers/hetzner/modules/services/caddy.nix

@@ -1,10 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: let
-  domain = "severijnse.eu";
+{...}: let
   antiScrape = ''
     @bad_bot {
       header_regexp User-Agent "(?i)(scrapy|cpython-requests|python-requests|curl|wget|go-http-client|ltx71|petalbot|bytespider|dotbot|ahrefsbot|semrushbot|mj12bot|dataforseo|facebookexternalhit|claudebot|anthropic-ai|perplexity|gptbot|chatgpt-user|omnisci|imgproxy|ccbot|exabot|360spider|baiduspider|sogou|duckduckgo|amazonbot|cohere-ai|diffbot|imagesiftbot).*"

servers/hetzner/modules/services/coredns.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: let
+{pkgs, ...}: let
   zoneFile = pkgs.writeText "severijnse.eu.db" ''
     $ORIGIN severijnse.eu.
     $TTL 3600

servers/hetzner/modules/services/fail2ban.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   # Keep fail2ban as OCI container to preserve the web UI
   virtualisation.oci-containers.containers.fail2ban = {
     image = "crazymax/fail2ban:latest";

servers/hetzner/modules/services/gitea.nix

@@ -1,7 +1,5 @@
 {
-  config,
   pkgs,
-  lib,
   unstablePkgs,
   ...
 }: {

servers/hetzner/modules/services/mailserver.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.mailserver = {
     image = "ghcr.io/docker-mailserver/docker-mailserver:latest";
     autoStart = true;

servers/hetzner/modules/services/rustdesk.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers = {
     hbbr = {
       image = "rustdesk/rustdesk-server:latest";

servers/hetzner/modules/services/shkeeper.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.shkeeper = {
     image = "vsyshost/shkeeper:2.5.29";
     autoStart = true;

servers/hetzner/modules/services/snappymail.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.snappymail = {
     image = "djmaze/snappymail:latest";
     autoStart = true;

servers/hetzner/modules/services/tlsa-updater.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: let
+{pkgs, ...}: let
   # Caddy's canonical certificate storage (XDG data dir). Renewals land here,
   # owned caddy:caddy 0600 — the mail server's non-root Postfix/Dovecot cannot
   # read it directly, so we copy it into a world-readable distribution dir.

servers/hetzner/modules/services/vaultwarden.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.vaultwarden = {
     image = "vaultwarden/server:latest";
     autoStart = true;

servers/hetzner/modules/services/watchtower.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.watchtower = {
     image = "ghcr.io/nicholas-fedor/watchtower:latest";
     autoStart = true;

servers/hetzner/modules/services/wireguard.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.wg-easy = {
     image = "ghcr.io/wg-easy/wg-easy:latest";
     autoStart = true;

servers/hetzner/modules/services/wrxproxy.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{...}: {
   virtualisation.oci-containers.containers.wrxproxy = {
     image = "localhost/wrxproxy:latest";
     autoStart = false;

servers/hetzner/modules/system/env.nix

@@ -1,9 +1,4 @@
-{
-  config,
-  pkgs,
-  lib,
-  ...
-}: {
+{pkgs, ...}: {
   time.timeZone = "Europe/Amsterdam";
 
   i18n.defaultLocale = "en_US.UTF-8";