feat(docker): add async port change and docker compose reload for services

- Introduce async `change_port` to update service port and reload docker compose
- Add `run_docker_command` for running docker compose commands asynchronously
- Implement `_get_random_port` utility for selecting available ports
- Refactor service discovery and port change logic to use new async methods
- Update proxy and manager logic to support new port change workflow

app/integrations/docker/ports.py

@@ -1,6 +1,19 @@
+import socket
 from collections.abc import Mapping
 
 
+def _get_random_port() -> int:
+    # os automatically assigns an available port when binding to port 0, so we can use that to find a free port
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            s.bind(('', 0))
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            port = s.getsockname()[1]
+            return port
+    except Exception as e:
+        raise RuntimeError(f"Could not find an available port: {e}")
+
+
 def _get_service_port(mapping: str | int | Mapping[str, object]) -> int | None:
     if isinstance(mapping, int):
         return mapping