Fix notification expiry issue

What's Changed

• dart docs by @murali-shris in #463
• Pin Dart SDK version in secondary Dockerfiles by @cpswan in #468
• Bump leonsteinhaeuser/project-beta-automations from 1.0.3 to 1.1.0 by @dependabot in #471
• Notification expiry by @srieteja in #442
• Bump docker/build-push-action from 2.7.0 to 2.8.0 by @dependabot in #473
• Change secondary config to use Dart logging's Levels, and set default to INFO by @gkc in #476
• changes to support reset of ttb by @srieteja in #475
• Update pubspec.yaml by @srieteja in #477
• Update pubspec.yaml for at_secondary by @srieteja in #478
• Changed return type for _getLocalKeys function. by @yahu1031 in #461
• update at_secondary_server version in pubspec.yaml and CHANGELOG.md by @kalluriramkumar in #479
• Set isEncrypted to true for cached keys. by @kalluriramkumar in #480

New Contributors

• @srieteja made their first contribution in #442

Full Changelog: v3.0.10...c3.0.12

Canary changes to logging level

Merge pull request #461 from atsign-foundation/issue-458

Changed return type for `_getLocalKeys` function.

Release v3.0.10

Workaround for signing private key not found

Workaround for signing private key not found

Merge pull request #460 from atsign-foundation/release-v3.0.10

release v3.0.10

Release v3.0.9

v3.0.9 contains the following the changes:

1. Release notification expiry
2. Enhance commit log compaction
3. Remove logging of sync data

Remove logging of sync data.

Merge pull request #440 from atsign-foundation/sync_memory_bug

remove logging values in progressive sync

Release notification expiry and commit log compaction

Release notification expiry and commit log compaction into canary.

Reduce compaction interval to 12 hrs

1. Reduce compaction interval to 12 hrs
2. Compaction delete bug fix

Changes related to compaction of logs.

Contains changes on compaction of access log and commit log.

Canary - Compaction bug fix (take 2)

c3.0.8a

Merge pull request #398 from atsign-foundation/cpswan-canary-version-…