v1.0-rc

What's Changed

• add changelog for 0.12.0 and 0.12.1 by @cpanato in #1064
• add description on /api/v1/index/retrieve endpoint by @bobcallaway in #1073
• Adding e2e test coverage by @cdris in #1071
• export rekor build/version information by @cpanato in #1074
• Use POST instead of GET for /api/log/entries/retrieve metrics. by @var-sdk in #1083
• Search through all shards when searching by hash by @priyawadhwa in #1082
• Update CHANGELOG.md for 0.12.2 release by @priyawadhwa in #1085
• verify: verify checkpoint's STH against the inclusion proof root hash by @asraa in #1092
• add ability to enable/disable specific rekor API endpoints by @bobcallaway in #1080
• enable configurable client retries with backoff in RekorClient by @bobcallaway in #1096
• remove dead code around api-key and timestamp references by @bobcallaway in #1098
• update swagger API version to 1.0.0 by @bobcallaway in #1102
• remove unused RekorVersion API definition by @bobcallaway in #1101
• install gocovmerge in hack/tools by @bobcallaway in #1103
• Cut 1.0 prerelease by @priyawadhwa in #1105

Full Changelog: v0.12.1...v1.0-rc