bridge: add brn to bridge resource

app/models/bridges.py

@@ -51,6 +51,16 @@ class Bridge(AbstractResource):
 
     conf = db.relationship("BridgeConf", back_populates="bridges")
 
+    @property
+    def brn(self) -> BRN:
+        return BRN(
+            group_id=self.conf.group_id,
+            product="bridge",
+            provider=self.conf.provider,
+            resource_type="bridge",
+            resource_id=str(self.id)
+        )
+
     @classmethod
     def csv_header(cls) -> List[str]:
         return super().csv_header() + [