Fix audb.available() for S3 / Minio backends

[hagenw]

This fixes the code introduced in #458 for S3/Minio backends and audb.available().

We still cannot add a test for it, this will be done later when we are ready for #450.

Summary by Sourcery

Bug Fixes:

• Fix the handling of object names in S3 and Minio backends by removing trailing slashes to ensure correct path formation.

[sourcery-ai]

Reviewer's Guide by Sourcery

The PR fixes the audb.available() functionality for S3/MinIO backends by correcting the object name handling and path construction in the list operations. The changes ensure proper traversal of database versions in S3/MinIO storage structures.

Sequence diagram for S3/MinIO object listing in audb.available()

sequenceDiagram
    participant User
    participant audb as audb.available()
    participant Backend
    participant S3MinIO as S3/MinIO

    User->>audb: Call audb.available()
    audb->>Backend: Initialize backend client
    Backend->>S3MinIO: list_objects(repository.name)
    S3MinIO-->>Backend: Return object list
    Backend->>audb: Process object names
    audb->>Backend: list_objects(repository.name, f"{name}/")
    Backend->>S3MinIO: List objects with prefix
    S3MinIO-->>Backend: Return versioned object list
    Backend->>audb: Process versioned object names
    audb-->>User: Return available databases

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File-Level Changes

Change	Details	Files
Fix S3/MinIO object listing and path handling	Remove trailing slash from object name when processing database names Add explicit forward slash when listing objects for version detection Improve path construction for header file detection	audb/core/api.py

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[sourcery-ai]

Hey @hagenw - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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