hosts/skycam: add archiver script

hosts/skycam/default.nix

@@ -31,6 +31,33 @@
       };
     };
 
+  systemd.services.skycam-archiver =
+    let
+      snapshotScript = pkgs.writeShellScript "skycam-archiver" ''
+        ${pkgs.lib.getExe pkgs.curl} -s -o "/var/lib/skycam-archiver/snapshot-$(date +%Y%m%d-%H%M%S).jpg" "http://skycam.mesh.vimium.net:1984/api/frame.jpeg?src=rpicam"
+      '';
+    in
+    {
+      description = "Capture skycam snapshot and save with timestamp";
+      serviceConfig = {
+        Type = "oneshot";
+        StateDirectory = "skycam-archiver";
+        ExecStart = "${snapshotScript}";
+      };
+      requires = [ "go2rtc.service" ];
+      after = [ "go2rtc.service" ];
+    };
+
+  systemd.timers.skycam-archiver = {
+    description = "Timer for capturing skycam snapshots every 30 minutes";
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnBootSec = "5min";
+      OnUnitActiveSec = "30min";
+      Unit = "skycam-archiver.service";
+    };
+  };
+
   environment.systemPackages = with pkgs; [
     git
     neovim