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Increase docker shm size

Jay McCure requested to merge jmc-shm-size-inc into master

What does this MR do and why?

Runs gitlab with a shm_size of 256mb as recommended in https://docs.gitlab.com/ee/install/docker_troubleshooting.html#devshm-mount-not-having-enough-space-in-docker-container

package-and-test jobs are failing due to Can't reserve 4194304 bytes for memory-mapped file in /dev/shm/gitlab/puma/counter_puma_6-0.db: ENOSPC: No space left on device errors

gitlab-org/quality/engineering-productivity/master-broken-incidents#7229 (comment 1989062759)

https://gitlab.slack.com/archives/C02PF508L/p1720490205354959

How to set up and validate locally

Test pipeline in the gitlab project with this branch here: https://gitlab.com/gitlab-org/gitlab/-/pipelines/1365751233 ✅

Gemfile change is: gitlab!158723 (diffs)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Jay McCure

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