WIP: Qa subsequent review app deployment

What does this MR do?

This MR isn't meant to be merged.

This MR sets the CNG_BRANCH to force-image-build-for-unicorn-sidekiq-and-task-runner so that the CNG images are built based on the changes from gitlab-org/build/CNG!260 (merged).

The goal is to make sure that subsequent Review App deployments actually deploy any new changes.

First deployment (6ea99ea5):

• review-build-cng (https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/280902625)

• (CNG pipeline) gitlab-rails-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/280929893)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  6ea99ea5
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce@sha256:b5efacd8490a98359b4ad5f868c75680d73680ee5427814565e95fdbdd376d56 cat /srv/gitlab/REVISION
  6ea99ea5

• (CNG pipeline) gitlab-sidekiq-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/280929899)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  6ea99ea5
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce@sha256:758eb663e829bd65b00eb104758e0f7debd8ee025ae009667ba4ac1198f47e70 cat /srv/gitlab/REVISION
  6ea99ea5

• (CNG pipeline) gitlab-task-runner-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/280929895)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  6ea99ea5
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce@sha256:5aaa9ecdcb4f42149192ab9dd2421b3c1280c7f454e05983da3f20c19a0c4c48 cat /srv/gitlab/REVISION
  6ea99ea5

• (CNG pipeline) gitlab-unicorn-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/280929897)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  6ea99ea5
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce@sha256:845044b64bab789cd08062f92f245f798e7191adc438c15816d424b0e1d9eb1c cat /srv/gitlab/REVISION
  6ea99ea5

Second deployment (4b8839f9):

• review-build-cng (https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/281287713)

• (CNG pipeline) gitlab-rails-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/281321282)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  4b8839f9
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-rails-ce@sha256:56b8e8ce5ca8946980b6a9b4ac9f36b5dda91a3a6a53ec1d4f5da168b0ea2aea cat /srv/gitlab/REVISION
  4b8839f9

• (CNG pipeline) gitlab-sidekiq-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/281321285)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  4b8839f9 
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-sidekiq-ce@sha256:06091951a83370acf6300aeee267a4175215b6273e867ee05026f60b517acf63 cat /srv/gitlab/REVISION
  4b8839f9 

• (CNG pipeline) gitlab-task-runner-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/281321283)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  4b8839f9 
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-task-runner-ce@sha256:62d53af73105ac6fa43c47a03796c69e2a9661cd74b2df82e4ccffac302747cb cat /srv/gitlab/REVISION
  4b8839f9 

• (CNG pipeline) gitlab-unicorn-ce (https://gitlab.com/gitlab-org/build/CNG-mirror/-/jobs/281321284)

  › docker pull registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce:force-image-build-for-unicorn-sidekiq-and-task-runner
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce:force-image-build-for-unicorn-sidekiq-and-task-runner cat /srv/gitlab/REVISION
  4b8839f9 
  
  › docker run --rm registry.gitlab.com/gitlab-org/build/cng-mirror/gitlab-unicorn-ce@sha256:a889433a109a103308c4d2f6326d5d9253f3e6865d9d4578048f4c08aa2cb190 cat /srv/gitlab/REVISION
  4b8839f9 

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/66519.