python3.pkgs.paperwork-backend: fix flaky test

pkgs/applications/office/paperwork/flaky_test.patch

@@ -0,0 +1,12 @@
+diff --git a/paperwork-backend/tests/docimport/tests_converted.py b/paperwork-backend/tests/docimport/tests_converted.py
+index 1d1ae39b..bda63fce 100644
+--- a/paperwork-backend/tests/docimport/tests_converted.py
++++ b/paperwork-backend/tests/docimport/tests_converted.py
+@@ -102,6 +102,7 @@ class TestConvertedImport(unittest.TestCase):
+                 )
+             )
+ 
++    @unittest.skip("flaky test: https://gitlab.gnome.org/World/OpenPaperwork/paperwork/-/issues/1035#note_1493700")
+     def test_import_duplicated_docx(self):
+         with tempfile.TemporaryDirectory() as tmp_dir:
+             self.config.settings = {

pkgs/applications/office/paperwork/paperwork-backend.nix

@@ -31,7 +31,14 @@ buildPythonPackage rec {
 
   sourceRoot = "source/paperwork-backend";
 
-  patchPhase = ''
+  patches = [
+    # disables a flaky test https://gitlab.gnome.org/World/OpenPaperwork/paperwork/-/issues/1035#note_1493700
+    ./flaky_test.patch
+  ];
+
+  patchFlags = [ "-p2" ];
+
+  postPatch = ''
     echo 'version = "${version}"' > src/paperwork_backend/_version.py
     chmod a+w -R ..
     patchShebangs ../tools