migrate chunk to caddy module

Signed-off-by: cy <cy@cy7.sh>

modules/caddy.nix

@@ -1,29 +1,27 @@
 {
   config,
   lib,
-  pkgs,
   ...
 }:
 let
   cfg = config.my.caddy;
-  commonExtraConfig = ''
-    encode zstd gzip
-    header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
-  '';
 in
 {
   options.my.caddy = {
     enable = lib.mkEnableOption "caddy reverse proxy";
-    acmeCa = lib.mkOption {
-      type = lib.types.str;
-    };
   };
 
   config = lib.mkIf cfg.enable {
     services.caddy = {
       enable = true;
       logFormat = lib.mkForce "level INFO";
-      acmeCa = "https://acme-v02.api.letsencrypt.org/directory";
+      acmeCA = "https://acme-v02.api.letsencrypt.org/directory";
+      extraConfig = ''
+        (common) {
+          encode zstd gzip
+          header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
+        }
+      '';
     };
   };
 }

modules/default.nix

@@ -2,5 +2,6 @@
 {
   imports = [
     ./backup.nix
+    ./caddy.nix
   ];
 }