CI: improve image cache handling

See merge request gitlab-org/build/CNG!988

Bump container registry to v3.39.2

See merge request gitlab-org/build/CNG!987

fix(gitlab-pages): graceful termination

See merge request gitlab-org/build/CNG!979

Update CI certification job for latest gitlab-omnibus-builder image

See merge request gitlab-org/build/CNG!873

Bump container registry to v3.39.1

See merge request gitlab-org/build/CNG!982

fix: gitlab-workhorse graceful termination

See merge request gitlab-org/build/CNG!972

What
---
Move the gitlab-pages process to be PID 1 inside of the container by using `exec` in start up script
and CMD in exec form as well.

Why
---
In https://gitlab.com/gitlab-org/charts/gitlab/-/issues/3249

 we found
out that most image we build their main process doesn't run as PID 1.
This can lead to issues where we assume `SIGTERM` is being sent to the
process but it isn't, it's sent to the bash script that starts the
process which doesn't redirect the signal to the gitlab-pages process.

Signed-off-by: Steve Azzopardi <sazzopardi@gitlab.com>
Reference: https://gitlab.com/gitlab-org/charts/gitlab/-/issues/3249

What
---
- Move `gitlab-workhorse` process to PID 1
- Add feature flag to set `gitlab-workhorse` in PID 1. Off by default,
  and will be removed after successful rollout in GitLab.com

Why
---
GitLab-workhorse supports [graceful
termination](https://gitlab.com/gitlab-org/gitlab/-/issues/325114),
however, we are not [using
it](https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15497#note_911366252),
this causes the `gitlab-workhorse` pod to run for `30s` on shutdown
responding with `502` and then receiving `SIGKILL`.

By default Kubernetes sends `SIGTERM` to PID `1` in the container, and
workhorse [listens for this
signal](https://gitlab.com/gitlab-org/gitlab/-/blob/dbeafad46dda53092c0eb46eceb2337a83f3ee9c/workhorse/main.go#L242)
however workhorse is not `PID` 1 as seen in the process tree below, this
is because of 2 reasons:

1. `CMD` isn't passed as an array.
   https://docs.docker.com/engine/reference/builder/#cmd in it
   specifies: `CMD command param...

toolbox: Add redis-tools for Redis client

See merge request gitlab-org/build/CNG!968

Changelog: added

Include ruby version in gitlab-go container version

See merge request gitlab-org/build/CNG!971

Update Node from 14 to 16.14.2 and Yarn to 1.22.5 to 1.22.18

See merge request gitlab-org/build/CNG!965

Install missing transient dependencies

Closes gitlab-org/gitlab#358890

See merge request gitlab-org/build/CNG!974

Adopt new tcr registry

See merge request gitlab-cn/build/cng-images!21

Bump container registry to v3.39.0

See merge request gitlab-org/build/CNG!973