feat: add retry connection to ollama

When Ollama is running in the docker-compose, traefik is not ready sometimes to route the request, and it fails

...

private_gpt/utils/retry.py

@@ -0,0 +1,31 @@
+import logging
+from collections.abc import Callable
+from typing import Any
+
+from retry_async import retry as retry_untyped  # type: ignore
+
+retry_logger = logging.getLogger(__name__)
+
+
+def retry(
+    exceptions: Any = Exception,
+    *,
+    is_async: bool = False,
+    tries: int = -1,
+    delay: float = 0,
+    max_delay: float | None = None,
+    backoff: float = 1,
+    jitter: float | tuple[float, float] = 0,
+    logger: logging.Logger = retry_logger,
+) -> Callable[..., Any]:
+    wrapped = retry_untyped(
+        exceptions=exceptions,
+        is_async=is_async,
+        tries=tries,
+        delay=delay,
+        max_delay=max_delay,
+        backoff=backoff,
+        jitter=jitter,
+        logger=logger,
+    )
+    return wrapped  # type: ignore