docs: update release instructions for Charts

See merge request !734

feat(handlers): log warning when eligibility flag is not set in migration mode

See merge request !735

build: upgrade gitlab.com/gitlab-org/labkit from v1.6.0 to v1.9.0

See merge request !737

ci: use golang:1.17-buster as the default image

See merge request !736

refactor: move away from ioutil (deprecated)

See merge request !738

feat(handlers): log metadata when a manifest is uploaded or downloaded

See merge request !739

# [3.10.0](v3.9.0-gitlab...v3.10.0-gitlab) (2021-08-23)

### Features

* **handlers:** log metadata when a manifest is uploaded or downloaded ([e078c9f5](e078c9f5))
* **handlers:** log warning when eligibility flag is not set in migration mode ([fe78327b](fe78327b))