fangfrisch: add override to support socks proxies

fangfrisch relies on python's requests which can use proxies by setting
environment variables `HTTP_PROXY`, `ALL_PROXY`, etc. To support a socks
proxy, set via `ALL_PROXY`, it needs the `pysocks` dependency.

pkgs/by-name/fa/fangfrisch/package.nix

@@ -3,6 +3,9 @@
   python3,
   fetchFromGitHub,
   nix-update-script,
+
+  # support setting socks proxies in `ALL_PROXY` environment variable
+  supportSocks ? true,
 }:
 let
   version = "1.9.2";
@@ -24,10 +27,13 @@ python3.pkgs.buildPythonApplication {
     python3.pkgs.wheel
   ];
 
-  propagatedBuildInputs = with python3.pkgs; [
-    requests
-    sqlalchemy
-  ];
+  propagatedBuildInputs =
+    with python3.pkgs;
+    [
+      requests
+      sqlalchemy
+    ]
+    ++ lib.optional supportSocks pysocks;
 
   pythonImportsCheck = [ "fangfrisch" ];