python3Packages.python-etcd: disable tests on aarch64

aarch64 is not fully supported, causing the build to fail due to test errors

pkgs/development/python-modules/python-etcd/default.nix

@@ -9,6 +9,7 @@
   etcd_3_4,
   mock,
   pyopenssl,
+  stdenv,
 }:
 
 buildPythonPackage {
@@ -37,6 +38,9 @@ buildPythonPackage {
     pyopenssl
   ];
 
+  # arm64 is an unsupported platform on etcd 3.4. should be able to be removed on >= etcd 3.5
+  doCheck = !stdenv.isAarch64;
+
   preCheck = ''
     for file in "test_auth" "integration/test_simple"; do
       substituteInPlace src/etcd/tests/$file.py \