feat: add s3 compatible endpoint

[loispostula]

• [ ] Bugfix (non-breaking change which fixes an issue)
• [ x ] New feature (non-breaking change which adds functionality)

Proposed changes

Add feature to allow usage of s3 compatible storage (like minio)

Checklist

• [ x ] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the forum/slack team.
• [ x ] I have run grunt to verify the unit tests pass
• [ x ] I have added suitable unit tests to cover the new/changed functionality