Review apps 2.0

Last missing piece (I think) for #735 (closed)

Also see https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/11021

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TL;DR: We need an image with gsutil installed, a tool from Google Cloud SDK that uploads the Pages HTML files to a GCP bucket.

We have three options:

• Option 1 - Same image as www-gitlab-com with patched gsutil: The www-gitlab-com project uses registry.gitlab.com/gitlab-org/gitlab-build-images:www-gitlab-com-debian-bullseye-ruby-3.0-node-16 built from this Dockerfile. This image uses a patched version of gsutil, and installs a bunch of other libraries that we don't need, see the installation script. It is the biggest of the three images at 700+MB.
• Option 2 - Our own image with patched gsutil: In order to not pull all the unneeded to us packages installed in the previous option, we can create our own stripped down image with the patched gsutil included.
• Option 3 - Our own image with standard gsutil: We can use the workaround Stan suggested in https://github.com/GoogleCloudPlatform/gsutil/pull/1430#issuecomment-1010256231 with the standard gsutil and install it as a Debian package.

I have pushed the last two images in my playground https://gitlab.com/axil/playground/container_registry/3529816 and used them in my tests.