Ensure we use application/octet-stream for file upload.

Nexus, at the minimum, will fail to process the uploaded file if we
omit this header (I assume it considers the incoming body as text vs
a stream of bytes).

Nexus also doesn't return a body on succesful create. This caused
the upload_result to be empty, which made the artifact value empty,
which caused a failure. Always create a valid return value
that describes the HTTP status code, the reason, and any body.

src/ploigos_step_runner/utils/file.py

@@ -267,11 +267,17 @@ def upload_file(file_path, destination_uri, username=None, password=None): # pyl
             opener = urllib.request.build_opener()
 
         with open(file_path, 'rb') as file:
-            request = urllib.request.Request(url=destination_uri, data=file.read(), method='PUT')
+            request = urllib.request.Request(url=destination_uri, data=file.read(), method='PUT',
+                                             headers={'Content-Type': 'application/octet-stream'})
 
             try:
                 result = opener.open(request)
-                upload_result = str(result.read(), encoding='utf8')
+                response_reason = result.reason
+                response_body = str(result.read(), encoding='utf8')
+                response_code = result.status
+                upload_result = f"status={response_code}, " \
+                                f"reason={response_reason}, " \
+                                f"body={response_body}"
             except urllib.error.HTTPError as error:
                 raise RuntimeError(
                     f"Error uploading file ({file_path}) to destination ({destination_uri})"

tests/utils/test_file.py

@@ -183,6 +183,8 @@ def __create_http_response_side_effect(self, read_return):
         def http_response_side_effect(request):
             mock_response = Mock()
             mock_response.read.return_value = read_return
+            mock_response.status = '201'
+            mock_response.reason = 'Created'
             return mock_response
 
         return http_response_side_effect
@@ -278,7 +280,7 @@ def test_http_prefix_no_auth(self, opener_open_mock):
             file_path=sample_file_path,
             destination_uri="http://ploigos.com/test/foo42"
         )
-        self.assertEqual('hello world 42', actual_result)
+        self.assertEqual('status=201, reason=Created, body=hello world 42', actual_result)
 
     @patch.object(
          urllib.request.OpenerDirector,
@@ -297,7 +299,7 @@ def test_https_prefix_no_auth(self, opener_open_mock):
             file_path=sample_file_path,
             destination_uri="https://ploigos.com/test/foo42"
         )
-        self.assertEqual('hello world 42', actual_result)
+        self.assertEqual('status=201, reason=Created, body=hello world 42', actual_result)
 
     @patch.object(
          urllib.request.OpenerDirector,
@@ -319,7 +321,7 @@ def test_https_prefix_auth(self, pass_manager_mock, opener_open_mock):
             username='test_user',
             password='pass123'
         )
-        self.assertEqual('hello world 42', actual_result)
+        self.assertEqual('status=201, reason=Created, body=hello world 42', actual_result)
 
         pass_manager_mock().add_password.assert_called_once_with(
             None,