docker: pin minio version to avoid fs errors

[egabancho]

Newer versions of Minio drop support for MinIO Gateway and the related filesystem mode.
From the documentation (https://min.io/docs/minio/linux/operations/install-deploy-manage/migrate-fs-gateway.html)

Deployments still using the standalone or filesystem MinIO modes that upgrade to RELEASE.2022-10-29T06-21-33Z or later receive an error when attempting to start MinIO.

Important

Standalone/file system mode continues to work on any release up to and including RELEASE.2022-10-24T18-35-07Z. To continue using a standalone deployment, install that MinIO release or any earlier release.

If someone has a better solution, I'll be happy to check it out.

[fenekku]

Fine by me, but Tom is probably better suited to assess this since they use S3 and we don't.

[tmorrell]

Makes sense to me. minio is only used for local development, so pinning a specific version seems fine. We and probably most other sites use AWS S3 or another cloud provider for testing and production.