docs: import PUT API

See merge request gitlab-org/container-registry!821

feat(handlers/configuration): enable manifest payload size limit

See merge request gitlab-org/container-registry!818

fix: remove temporary log entries for "finding repository by path" queries

See merge request gitlab-org/container-registry!827

chore(datastore): add fixures for unlinked layers importer test

See merge request gitlab-org/container-registry!823

test(handlers_test): move base url test to conformance test suite

See merge request gitlab-org/container-registry!829

fix(datastore): skip caching of large configuration payloads

See merge request gitlab-org/container-registry!826

feat: add Google CDN support

See merge request gitlab-org/container-registry!828

fix(datastore): check for blob access before importing layer

See merge request gitlab-org/container-registry!822

# [3.20.0](gitlab-org/container-registry@v3.19.0-gitlab...v3.20.0-gitlab) (2021-12-30)

### Bug Fixes

* **datastore:** check for blob access before importing layer ([84cf6399](gitlab-org/container-registry@84cf6399))
* **datastore:** skip caching of large configuration payloads ([748dbaa4](gitlab-org/container-registry@748dbaa4))
* remove temporary log entries for "finding repository by path" queries ([090e34cd](gitlab-org/container-registry@090e34cd))

### Features

* add Google CDN support ([612e8619](gitlab-org/container-registry@612e8619))
* **handlers/configuration:** enable manifest payload size limit ([db18ba18](gitlab-org/container-registry@db18ba18))