fix: use ghcr.io as default registry

app.py

@@ -147,7 +147,7 @@ class NotifyOn(Enum):
 class Config:
     """Application configuration from environment variables."""
 
-    registry_url: str = field(default_factory=lambda: os.getenv("REGISTRY_URL", "ghcr.io/drengskapur"))
+    registry_url: str = field(default_factory=lambda: os.getenv("REGISTRY_URL", "ghcr.io"))
     registry_user: str = field(default_factory=lambda: os.getenv("REGISTRY_USER", ""))
     registry_password: str = field(default_factory=lambda: os.getenv("REGISTRY_PASSWORD", ""))
     github_token: str = field(default_factory=lambda: os.getenv("GITHUB_TOKEN", ""))