Merge pull request #21877 from sheenobu/nixos/caddy/custom-pkg

caddy: add package config option

nixos/modules/services/web-servers/caddy.nix

@@ -39,6 +39,13 @@ in
       type = types.path;
       description = "The data directory, for storing certificates.";
     };
+
+    package = mkOption {
+      default = pkgs.caddy;
+      defaultText = "pkgs.caddy";
+      type = types.package;
+      description = "Caddy package to use.";
+    };
   };
 
   config = mkIf cfg.enable {
@@ -47,7 +54,7 @@ in
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
       serviceConfig = {
-        ExecStart = ''${pkgs.caddy.bin}/bin/caddy -conf=${configFile} \
+        ExecStart = ''${cfg.package.bin}/bin/caddy -conf=${configFile} \
           -ca=${cfg.ca} -email=${cfg.email} ${optionalString cfg.agree "-agree"}
         '';
         Type = "simple";