Also include a class method for retriving the gitlab_deploy_token on
DeployTokens

Also:
- Includes more specs
- Improves a bit the documentation

- If a deploy token with a name 'gitlab-deploy-token' is exists for the
  project, CI_DEPLOY_USER and CI_DEPLOY_PASSWORD variables will be
expose

Downgrade MySQL CI service from 8.0 to 5.7

Closes #45606

See merge request gitlab-org/gitlab-ce!18512

add restart of gitlab-pages to apply gitlab pages settings

See merge request gitlab-org/gitlab-ce!18455

MySQL 8.0 made the default authentication mode `caching_sha2_password`, and
this breaks our CI builds at the moment. Downgrade until we can figure
out how to support this.

Closes #45606

Atomic internal ids for all models

Closes #44259

See merge request gitlab-org/gitlab-ce!18402

Add documentation on how to configure Redis Sentinel by persistent class

See merge request gitlab-org/gitlab-ce!18441

Don't include lfs_file_locks data in export bundle

Closes #45502

See merge request gitlab-org/gitlab-ce!18495

Add an API endpoint to download git repository snapshots

Closes #39345

See merge request gitlab-org/gitlab-ce!18173

Resolve "Show new branch/merge request button even if a branch / merge request already exists"

Closes #42803

See merge request gitlab-org/gitlab-ce!17712

[ci skip]

Resolve "Text from the diff is showing within a table header inside the discussion after the discussion is resolved"

Closes #45514

See merge request gitlab-org/gitlab-ce!18492

Resolve "Text from the diff is showing within a table header inside the discussion after the discussion is resolved"

Fix issues without links when added from boards new issue  modal

Closes #45435

See merge request gitlab-org/gitlab-ce!18460

Fix a documentation typo for GitLab pages

Closes #45568

See merge request gitlab-org/gitlab-ce!18489

Documentation: Frontend Building Checklist

See merge request gitlab-org/gitlab-ce!18394

Refactored activity calendar

See merge request gitlab-org/gitlab-ce!18469

Rename #qa slack channel to #quality in docs

See merge request gitlab-org/gitlab-ce!18472

Check Gitaly when running `rake dev:setup`

See merge request gitlab-org/gitlab-ce!18481

Respect visibility options and description when importing project from template

Closes #42601

See merge request gitlab-org/gitlab-ce!18473

Resolve "Improve tooltips of collapsed sidebars"

Closes #25010 et #44272

See merge request gitlab-org/gitlab-ce!17714

Define priority label for bugs

See merge request gitlab-org/gitlab-ce!18361

Update Container Scanning documentation

Closes #45543

See merge request gitlab-org/gitlab-ce!18479

Resolve "Geo: Statement timeout counting local job artifacts"

Closes #45476

See merge request gitlab-org/gitlab-ce!18444

Fix specifying a non-default ref when requesting an archive using the legacy URL

Closes #45507

See merge request gitlab-org/gitlab-ce!18468