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

home/packages/wayland/niri/_to-KDL.nix

@@ -36,10 +36,11 @@
     (
       if typeOf element == "null"
       then "null"
-      else if element == false
-      then "false"
-      else if element == true
-      then "true"
+      else if typeOf element == "bool"
+      then
+        if element
+        then "true"
+        else "false"
       else if typeOf element == "string"
       then ''"${sanitizeString element}"''
       else toString element

home/packages/wayland/niri/default.nix

@@ -8,7 +8,7 @@
   binds = import ./_binds.nix {inherit pkgs;};
   rules = import ./_rules.nix;
 
-  finalConfig = toKDL.generate "niri-config.kdl" (settings // {binds = binds;} // rules);
+  finalConfig = toKDL.generate "niri-config.kdl" (settings // {inherit binds;} // rules);
 in {
   environment.sessionVariables = {
     NIRI_CONFIG = "$HOME/.config/niri/config.kdl";