Implement SSH user data handling and adjust volume size

- Added functions to generate SSH user data in cloud-config format and encode it in Base64 for server creation.
- Updated the `create_gpu_server` function to include public key handling for SSH access.
- Adjusted the default boot volume size from 40GB to 30GB in `os_client.py`.
- Enhanced the `cmd_up` function to manage SSH key injection and server state more effectively.
- Improved logging for SSH connection attempts and error handling in `wait_ssh` to provide clearer feedback on authentication issues.

src/gpu_rent/ssh_ops.py

@@ -40,6 +40,7 @@ def wait_ssh(cfg: Config, host: str, timeout: float = 900.0) -> None:
     key = str(cfg.ssh_private_key_path)
     last = None
     attempt = 0
+    auth_fails = 0
     while time.time() < deadline:
         attempt += 1
         client = paramiko.SSHClient()
@@ -59,13 +60,26 @@ def wait_ssh(cfg: Config, host: str, timeout: float = 900.0) -> None:
             return
         except Exception as exc:
             last = exc
+            name = type(exc).__name__
+            if "Authentication" in name or "Authentication" in str(exc):
+                auth_fails += 1
             try:
                 client.close()
             except Exception:
                 pass
             if attempt == 1 or attempt % 6 == 0:
-                # Progress without paramiko traceback spam.
-                print(f"жду SSH {cfg.ssh_user}@{host}… ({type(exc).__name__})", flush=True)
+                print(f"жду SSH {cfg.ssh_user}@{host}… ({name})", flush=True)
+            # Key never injected (boot-from-volume): don't burn full timeout.
+            if auth_fails >= 8:
+                raise CloudError(
+                    f"SSH {cfg.ssh_user}@{host}: ключ отклонён (AuthenticationException). "
+                    "Nova keypair не попал в authorized_keys при boot-from-volume. "
+                    "Останови up (Ctrl+C), затем снова: gpu-rent up --yes "
+                    "(create теперь с config_drive + user_data). "
+                    "Или в консоли панели (root): "
+                    f"добавь содержимое {cfg.ssh_private_key_path}.pub в "
+                    f"/home/{cfg.ssh_user}/.ssh/authorized_keys"
+                ) from exc
             time.sleep(8)
     raise CloudError(
         f"SSH {cfg.ssh_user}@{host} не принял ключ за {int(timeout)} с ({last}). "