Garage v0.8.3

This minor release includes the following improvements and fixes:

Potentially breaking change:

- #567 changes how Garage nodes are advertised in Consul: the node ID is
  no longer advertised in the Consul Node metadata but in the Consul
  Service metadata. Migration has not been tested throughly, old data
  should be replaced automatically, but if it isn't, Consul discovery
  might be broken until old entries are purged manually.

New features:

- Scrub now emits a log message when it starts/ends (#551)

- Interaction with Consul can now use the agent API (#567)

- Support `{s3,web}.root_domain` for the Caddy on-demand TLS endpoint (#610)

- Web endpoint: support index on path missing a trailing slash (#612)

Bug fixes:

- block/manager.rs: Prioritize raw blocks when no compression configured (#566)

- Properly implement double-urlencoding for S3 signatures in K2V (#574)

- Fix timestamp issues in `garage block list-errors` (#584, #585)

Internals/refactoring:

- Build fixes and improvements (#562, #563, #568, #572, #599, #592)

- Code quality improvements (#570, #581, #586, #607)

- k2v-client refactoring (#571)

- Port k2v-client to aws-sigv4 and add basic integration testing (#577)

- New return type for PollRange in k2v-client (#590)

Other:

- Documentation improvements (#549, #219, #416, #430, #587, #588, #598, #604, #614, #616, #564)

- Dependency upgrades (#552, #559, #569, #591, #593, #606)

- Toolchain upgrade (#554)

- Helm chart update (#535, #565)

Thanks: arthurlutz, Florian Klink, Jakub Jirutka, Jonatan Steuernagel,
Jonathan Davies, Kamil Banach, Max Justus Spransy, Quentin Dufour,
Roberto Hidalgo, trinity-1686a, yuka.