post(caddy-2): must use "caddy reload" to reload config

- ce8860dbfe/init/caddy.service (L25)

source/_posts/caddy-v2-nixos.md

@@ -2,6 +2,7 @@
 title: Running Caddy 2 in NixOS 20.03
 excerpt: Use stable v2 instead of beta release
 date: 2020-05-24
+updated: 2020-08-30
 tags:
 - server
 - caddy
@@ -84,6 +85,11 @@ in {
         '' else ''
           ${cfg.package}/bin/caddy -root=/var/tmp -conf=${cfg.config}
         '';
+        ExecReload = if isCaddy2 then ''
+          ${cfg.package}/bin/caddy reload --config ${cfg.config} --adapter ${cfg.adapter}
+        '' else ''
+          "${pkgs.coreutils}/bin/kill -HUP $MAINPID"
+        '';
         ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
         Type = "simple";
         User = "caddy";