Users are not informed if a username is not found by getpwnam

[jmsmkn]

If a user uploads an algorithm and specifies a username as the container user, but that user does not exist in the containers password database their job is left in the executing state without an error message. See https://grand-challenge.sentry.io/issues/4882378255/events/2c2ce76e8676424088d6e6cdfd7a144a/

	2024-03-01T11:05:05.200+01:00	{"log": "Calling self.proc_args=['/bin/bash', '/home/user/process.sh']", "level": "INFO", "source": "stdout", "internal": true, "task": null}

2024-03-01T11:05:05.201+01:00	Traceback (most recent call last): File "sagemaker_shim/models.py", line 169, in _get_user_info

2024-03-01T11:05:05.201+01:00	KeyError: "getpwnam(): name not found: 'user'"

2024-03-01T11:05:05.201+01:00	During handling of the above exception, another exception occurred:

2024-03-01T11:05:05.201+01:00	Traceback (most recent call last): File "sagemaker_shim/models.py", line 172, in _get_user_info

2024-03-01T11:05:05.201+01:00	ValueError: invalid literal for int() with base 10: 'user'

2024-03-01T11:05:05.201+01:00	The above exception was the direct cause of the following exception:

2024-03-01T11:05:05.201+01:00	Traceback (most recent call last): File "sagemaker_shim/cli.py", line 112, in <module> File "click/core.py", line 1157, in __call__ File "click/core.py", line 1078, in main File "click/core.py", line 1688, in invoke File "click/core.py", line 1434, in invoke File "click/core.py", line 783, in invoke File "sagemaker_shim/cli.py", line 28, in wrapper File "asyncio/runners.py", line 190, in run File "asyncio/runners.py", line 118, in run File "asyncio/base_events.py", line 653, in run_until_complete File "sagemaker_shim/cli.py", line 103, in invoke File "sagemaker_shim/models.py", line 393, in invoke File "sagemaker_shim/models.py", line 417, in _invoke File "sagemaker_shim/models.py", line 502, in execute File "functools.py", line 1001, in __get__ File "sagemaker_shim/models.py", line 373, in proc_user File "sagemaker_shim/models.py", line 174, in _get_user_info

2024-03-01T11:05:05.201+01:00	RuntimeError: User 'user' not found

2024-03-01T11:05:05.201+01:00	[9] Failed to execute script 'cli' due to unhandled exception!