feat: store submission output to MinIO

[Bogay]

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[Copilot]

Pull Request Overview

This PR redirects submission outputs from GridFS to MinIO, updates related configuration, and adjusts tests to use a temporary MinIO container.

• Adds output_minio_path to CaseResult and stores zipped outputs in MinIO in process_result
• Introduces helper methods (_get_output_raw, _generate_output_minio_path) and updates retrieval (get_single_output, get_detailed_result)
• Changes test setup to start a MinIO container via Testcontainers and removes the pytest-minio-mock dependency

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/utils/submission.py	Calls submission.reload() after faking outputs
tests/unittest/test_problem.py	Removes obsolete MinIO mock setup
tests/conftest.py	Adds module-scoped Testcontainers MinIO fixture
pyproject.toml	Replaces pytest-minio-mock with testcontainers[minio]
mongo/utils.py	Switches Minio client to read credentials from config
mongo/submission.py	Implements MinIO storage for submission output
mongo/engine.py	Adds output_minio_path field and adjusts code definition
mongo/config.py	Tweaks default env handling for MinIO settings
model/submission.py	Updates HTTP status code for validation errors

Comments suppressed due to low confidence (2)

mongo/submission.py:194

• There are new behaviors in get_single_output and get_detailed_result that read from MinIO; add unit tests to verify output retrieval and error handling for missing or pending outputs.

    ) -> SubmissionResultOutput:

mongo/config.py:4

• [nitpick] Removing the default localhost:9000 for MINIO_HOST may break local development; consider retaining a sensible default or clearly documenting this change.

MINIO_HOST = os.getenv('MINIO_HOST')