gitlab_runner: Add service to cleanup docker artifacts produced by the runner

This is already deployed on runner2 (by hand).

changed the description

added 4 commits

• 871bb2ac...6dff5e8d - 2 commits from branch archlinux:master
• 88c6163d - gitlab_runner: Cap Docker's memory to 95% of system memory
• f4703b15 - gitlab_runner: Add service to cleanup containers,images and volumes produced by GitLab Runner

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changed title from gitlab_runner: Cap Docker's memory to 95% of system memory to gitlab_runner: Cap Docker's memory to 95% of system memory + cleanup service

changed the description

added 12 commits

• f4703b15...efa03c61 - 10 commits from branch archlinux:master
• f204f0a4 - gitlab_runner: Cap Docker's memory to 95% of system memory
• e7ae842e - gitlab_runner: Add service to cleanup containers,images and volumes produced by GitLab Runner

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Shall we just make this a generic docker cleanup service (that's not specific to GitLab Runners)? I think we can condense this down to just

docker system prune --all --force --volumes

added 77 commits

• e7ae842e...fb5e0503 - 76 commits from branch archlinux:master
• 6c2f6e7b - gitlab_runner: Add service to cleanup containers,images and volumes produced by GitLab Runner

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changed title from gitlab_runner: Cap Docker's memory to 95% of system memory + cleanup service to gitlab_runner: Add service to cleanup containers,images and volumes produced by GitLab Runner

changed the description

The memory limit has been split out into !415 (merged) and merged, so this MR is just the cleanup service now.

added 13 commits

• 6c2f6e7b...56e73a66 - 12 commits from branch archlinux:master
• e1686a7c - gitlab_runner: Add service to cleanup docker artifacts produced by the runner

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changed title from gitlab_runner: Add service to cleanup containers,images and volumes produced by GitLab Runner to gitlab_runner: Add service to cleanup docker artifacts produced by the runner

resolved all threads

added 1 commit

• 02f88738 - gitlab_runner: Add service to cleanup docker artifacts produced by the runner

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approved this merge request

merged

mentioned in commit e452d8ee