Vagrant box MinIO implementation is broken

In the process of testing FOLIO-3581, I discovered that the MinIO implementation on the Vagrant build is broken. To wit:

• The buckets used by the modules (mod-agreements, mod-licenses, mod-data-export, and mod-data-export-worker) must be created before the modules can use them.
• The S3 client used in mod-data-export-worker requires that the AWS_REGION environment variable be set to a non-empty string.
• The MinIO container needs to be configured so that it is addressable by both the Okapi modules and the Stripes client at the same address (not sure this is possible)
• The MinIO port (9500) must be exposed for the Stripes client to be able to download files