transmission: add notification when download finished

configs/workhorse/transmission.nix

@@ -95,6 +95,18 @@ in {
           # Start torrents as soon as they are added
 
           start-added-torrents = true;
+          script-torrent-done-enabled = true;
+          script-torrent-done-filename =
+            (pkgs.writers.writeBash "torrent-finished" ''
+              JSON_STRING=$( ${pkgs.jq}/bin/jq -n --arg torrent_name "$TR_TORRENT_NAME" \
+                '{text: ":tada: \($torrent_name)", channel: "torrent"}' )
+              ${pkgs.curl}/bin/curl \
+                --include \
+                --request POST \
+                --data-urlencode \
+                "payload=$JSON_STRING" \
+                ${lib.fileContents <common_secrets/mattermost_sink_url>}
+            '');
 
         };
       };