Switch to my own images, with dependencies satisfied

Necessary PHP modules, as well as Composer, are provided in the new images: https://git.ethitter.com/docker/images/container_registry.

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• 581e4544 - Switch to my images, with build steps satisfied

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added 2 commits

• 61836c5a - Allow now that I build a working image
• 4ffdb56e - PHPCS 2 compat

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unmarked as a Work In Progress

enabled an automatic merge when the pipeline for 4ffdb56e succeeds

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• e9e631b6 - PHPCS 2 compat

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enabled an automatic merge when the pipeline for e9e631b6 succeeds

added 1 commit

• 2534766e - PHPCS 2

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• 1ffc14b6 - Appeasing PHPCS

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enabled an automatic merge when the pipeline for 1ffc14b6 succeeds

merged

mentioned in commit aa217a9e