Garage v0.8.5

This minor release includes the following improvements and fixes:

New features:

- Configuration: make LMDB's `map_size` configurable and make `block_size` and `sled_cache_capacity` expressable as strings (such as `10M`) (#628, #630)

- Add support for binding to Unix sockets for the S3, K2V, Admin and Web API servers (#640)

- Move the `convert_db` command into the main Garage binary (#645)

- Add support for specifying RPC secret and admin tokens as environment variables (#643)

- Add `allow_world_readable_secrets` option to config file (#663, #685)

Bug fixes:

- Use `statvfs` instead of mount list to determine free space in metadata/data directories (#611, #631)

- Add missing casts to fix 32-bit build (#632)

- Fix error when none of the HTTP servers (S3/K2V/Admin/Web) is started and fix shutdown hang (#613, #633)

- Add missing CORS headers to PostObject response (#609, #656)

- Monitoring: finer histogram boundaries in Prometheus exported metrics (#531, #686)

Other:

- Documentation improvements (#641)
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