initial work on the reloader/watcher services for the site

this doesn't seem to entirely be working but it reloads?

I got an older version on the actual site even though the file did
change

not sure what's wrong will try to fix this later

hosts/chmura/jacekpoz.pl.nix

@@ -1,9 +1,15 @@
 {
     inputs,
+    lib,
     pkgs,
     ...
 }: let
+    inherit (lib) getExe';
+
+    systemctl = getExe' pkgs.systemd "systemctl";
+
     port = 4827;
+    sitePath = "/srv/web/jacekpoz.pl";
 in {
     services.caddy = {
         enable = true;
@@ -28,15 +34,18 @@ in {
         group = "site";
     };
 
-    systemd.services.pozback = {
+    systemd = {
+        services = {
+            pozback = {
                 description = "The backend for jacekpoz.pl";
-        wantedBy = ["default.target"];
+                after = ["network.target"];
+                wantedBy = ["multi-user.target"];
 
                 serviceConfig = {
                     Type = "simple";
                     ExecStart = "${inputs.pozsite.packages.${pkgs.system}.pozback}/bin/back";
                     Restart = "on-failure";
-            Environment = ''POZ_PORT="${toString port}" POZ_DIR="/srv/web/jacekpoz.pl"'';
+                    Environment = ''POZ_PORT="${toString port}" POZ_DIR="${sitePath}"'';
                     User = "site";
                     Group = "site";
                 };
@@ -46,4 +55,25 @@ in {
                     colorized-logs
                 ];
             };
+
+            pozback-watcher = {
+                description = "Restarter for the backend";
+                after = ["network.target"];
+                wantedBy = ["multi-user.target"];
+
+                serviceConfig = {
+                    Type = "oneshot";
+                    ExecStart = "${systemctl} restart pozback.service";
+                };
+            };
+        };
+        paths.pozback-watcher = {
+            wantedBy = ["multi-user.target"];
+
+            pathConfig = {
+                PathModified = sitePath;
+                Unit = "pozback-watcher.service";
+            };
+        };
+    };
 }