pythonPackages.docker_pycreds: Move to own file

pkgs/development/python-modules/docker-pycreds/default.nix

@@ -0,0 +1,22 @@
+{ stdenv, buildPythonPackage, fetchPypi, six }:
+
+buildPythonPackage rec {
+  pname = "docker-pycreds";
+  version = "0.2.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0j3k5wk3bww5y0f2rvgzsin0q98k0i9j308vpsmxidw0y8n3m0wk";
+  };
+
+  # require docker-credential-helpers binaries
+  doCheck = false;
+
+  propagatedBuildInputs = [ six ];
+
+  meta = with stdenv.lib; {
+    description = "Python bindings for the docker credentials store API.";
+    homepage = https://github.com/shin-/dockerpy-creds;
+    license = licenses.asl20;
+  };
+}