#60: Migration from Travis CI to Github CI - try to correct tests on …

…Github CI

```
No module named rkd
```

subpackages/rkd_python/test/test_standardlib_python_publish.py

@@ -26,7 +26,10 @@ def test_integration_is_output_properly_catch_by_sh(self):
         """
 
         # build first
-        subprocess.check_call(['python3', '-m', 'rkd', '--silent', ':py:build'], env={'RKD_PATH': RKD_PATH})
+        env = dict(os.environ)
+        env['RKD_PATH'] = RKD_PATH
+
+        subprocess.check_call(['python3', '-m', 'rkd', '--silent', ':py:build'], env=env)
 
         # try to publish
         out = self._call_publish_via_shell('--username=wrong --password=wrong --test').decode('utf-8')