gitlab_runner: Set reasonable NOFILE limits to avoid bugs

The default limits cause issues as reported upstream[1][2], it also breaks the mkinitcpio CI[3]. So match the limits set in systemd since v240[4].

[1] https://github.com/moby/moby/issues/38814
[2] https://github.com/containerd/containerd/pull/7566
[3] archlinux/mkinitcpio/mkinitcpio@da223d2f
[4] https://github.com/systemd/systemd/blob/4f44d2c4f76922a4f48dd4473e6abaca40d7e555/NEWS#L6556-L6590

approved this merge request

added 20 commits

• 5bbcd534...78a685a7 - 19 commits from branch archlinux:master
• 45d80caf - gitlab_runner: Set reasonable NOFILE limits to avoid bugs

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changed title from gitlab_runner: Set reasonable NOFILE limits to avoid CI issues to gitlab_runner: Set reasonable NOFILE limits to avoid bugs

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mentioned in commit d4501d5f

merged