Add __str__ and __repr__ to Registry class

Previously, logging a Registry object in docker-related keywords
produced unreadable memory addresses (e.g., <Registry object at
0x...>).

This commit adds __str__ and __repr__ methods to return a formatted
string like 'local_registry (registry.local:9001)'.

Type hints and docstrings were added to satisfy pre-commit linting.

Change-Id: Ic2b3c8263fe9e12d5149749ee93376d37803bdc6
Signed-off-by: Andrew Vaillancourt <andrew.vaillancourt@windriver.com>

config/docker/objects/registry.py

@@ -1,9 +1,16 @@
 class Registry:
-    """
-    Class for Registry object
-    """
+    """Represents a Docker registry configuration."""
 
     def __init__(self, registry_name: str, registry_url: str, user_name: str, password: str):
+        """
+        Initializes a Registry object.
+
+        Args:
+            registry_name (str): Logical name of the registry (e.g., "source_registry").
+            registry_url (str): Registry endpoint URL (e.g., "docker.io/starlingx").
+            user_name (str): Username for authenticating with the registry.
+            password (str): Password for authenticating with the registry.
+        """
         self.registry_name = registry_name
         self.registry_url = registry_url
         self.user_name = user_name
@@ -11,27 +18,54 @@ class Registry:
 
     def get_registry_name(self) -> str:
         """
-        Getter for registry name
-        Returns:
+        Returns the logical name of the registry.
 
+        Returns:
+            str: Registry name.
         """
         return self.registry_name
 
     def get_registry_url(self) -> str:
         """
-        Getter for registry url
-        Returns:
+        Returns the URL endpoint of the registry.
 
+        Returns:
+            str: Registry URL.
         """
         return self.registry_url
 
     def get_user_name(self) -> str:
         """
-        Getter for user name
-        Returns:
+        Returns the username used for registry authentication.
 
+        Returns:
+            str: Username.
         """
         return self.user_name
 
     def get_password(self) -> str:
+        """
+        Returns the password used for registry authentication.
+
+        Returns:
+            str: Password.
+        """
         return self.password
+
+    def __str__(self) -> str:
+        """
+        Returns a human-readable string representation of the registry.
+
+        Returns:
+            str: Formatted string showing registry name and URL.
+        """
+        return f"{self.registry_name} ({self.registry_url})"
+
+    def __repr__(self) -> str:
+        """
+        Returns the representation string of the registry.
+
+        Returns:
+            str: Registry representation.
+        """
+        return self.__str__()