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It seems like the update action fails (see https://github.com/wikimedia/mediawiki-docker/actions/runs/6345587761/job/17237820236#step:4:55) because of an invalid cert. According to google/go-github#1049 this is most likely caused by missing ca-certificates which this PR also installs in the pipeline.
While we are at it this also updates the readme to correctly reflect the current state of things, reformats the yaml a bit and updates the checkout action. 😊
This was locally tested to fix the issue using https://github.com/nektos/act/