Add Raspberry Pi Debian 12 build images

Add Raspberry Pi Debian 12 build images

- Add Container definitions for Raspberry Pi builders based on Debian 12
  and the related continuous integration jobs to build them

Closes https://gitlab.com/gitlab-org/gitlab-omnibus-builder/-/issues/77

Related https://gitlab.com/gitlab-org/omnibus-gitlab/-/issues/8398

Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

Closes Add Debian 12 Raspberry Pi container build images (#77 - closed) • Robert Marshall • 16.9

Related Add Debian 12 Raspberry Pi Package Build Jobs (omnibus-gitlab#8398 - closed) • Robert Marshall