imaginary: add -return-size flag

Apply https://github.com/h2non/imaginary/pull/382 as patch.

The -return-size flag is recommended by Nextcloud:
https://docs.nextcloud.com/server/latest/admin_manual/installation/server_tuning.html#previews

pkgs/servers/imaginary/default.nix

@@ -1,4 +1,10 @@
-{ lib, buildGoModule, fetchFromGitHub, pkg-config, vips }:
+{ lib
+, buildGoModule
+, fetchFromGitHub
+, fetchpatch
+, pkg-config
+, vips
+}:
 
 buildGoModule rec {
   pname = "imaginary";
@@ -11,6 +17,16 @@ buildGoModule rec {
     hash = "sha256-oEkFoZMaNNJPMisqpIneeLK/sA23gaTWJ4nqtDHkrwA=";
   };
 
+  patches = [
+    # add -return-size flag recommend by Nextcloud
+    # https://github.com/h2non/imaginary/pull/382
+    (fetchpatch {
+      name = "return-width-and-height-of-generated-images.patch";
+      url = "https://github.com/h2non/imaginary/commit/cfbf8d724cd326e835dfcb01e7224397c46037d3.patch";
+      hash = "sha256-TwZ5WU5g9LXrenpfY52jYsc6KsEt2fjDq7cPz6ILlhA=";
+    })
+  ];
+
   vendorHash = "sha256-BluY6Fz4yAKJ/A9aFuPPsgQN9N/5yd8g8rDfIZeYz5U=";
 
   buildInputs = [ vips ];
@@ -28,6 +44,6 @@ buildGoModule rec {
     changelog = "https://github.com/h2non/${pname}/releases/tag/v${version}";
     description = "Fast, simple, scalable, Docker-ready HTTP microservice for high-level image processing";
     license = licenses.mit;
-    maintainers = with maintainers; [ urandom ];
+    maintainers = with maintainers; [ dotlambda urandom ];
   };
 }