[14-7-backport] Use the openssh provided by the UBI repos

See merge request gitlab-org/build/CNG!878

Use curl v7.74 from buster backports

See merge request gitlab-org/build/CNG!862

This upgrades curl v7.64 to v7.79. We use curl v7.79 in Omnibus, so this
version matches closer to that. Also this fixes bugs such as
https://github.com/ably/ably-ruby/issues/215 that we are seeing in
production.

Changelog: changed

Bump container registry to v3.22.0

See merge request gitlab-org/build/CNG!861

Changelog: changed

CI: add final image size to output

Closes gitlab-org/charts/gitlab#1267

See merge request gitlab-org/build/CNG!857

Bump Container Registry to v3.21.0-gitlab

See merge request gitlab-org/build/CNG!859

Upgrade MailRoom to v0.0.18

See merge request gitlab-org/build/CNG!854

Remove gitlab-shell-libproxyproto image

See merge request gitlab-org/build/CNG!855

Update golang to 1.16.12

See merge request gitlab-org/build/CNG!853

This drops support for the custom gitlab-shell container with
libproxyproto support added in
https://gitlab.com/gitlab-org/build/CNG/-/merge_requests/657.

We no longer need a custom gitlab-shell built with libproxyproto, as
this container is not used and gitlab-sshd is almost in production
(https://gitlab.com/groups/gitlab-com/gl-infra/-/epics/603).

This reverts commit 43b50e73, reversing
changes made to ee6dc58b.

This adds JWT authentication to support delivering e-mail via an API
handler:
https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/1457

Diff: https://my.diffend.io/gems/gitlab-mail_room/0.0.15/0.0.18

Bump container registry to v3.20.0

See merge request gitlab-org/build/CNG!852

Upgrade to Postgres 14.1 for client libraries

See merge request gitlab-org/build/CNG!843

Changelog: changed

Adding skip flag to restore operation

See merge request gitlab-org/build/CNG!845

Changelog: added

Cleanup temp directories before creating backups

Closes gitlab-org/charts/gitlab#3041

See merge request gitlab-org/build/CNG!846

Changelog: changed

Notify of ruby upgrade process via Danger

Closes gitlab-org/distribution/team-tasks#969

See merge request gitlab-org/build/CNG!847

Fix offline prepare script

See merge request gitlab-org/build/CNG!851