Update actionlint and factor out its config into a reusable action. #1360
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So we don't have to update the version pinning etc. across multiple repos, since I'm about to add it to alphagov/govuk-ruby-images.
The actionlint check failure on this PR is expected (because the reusable action won't exist on
main
until this PR is merged).Tested: check passes when pointing at the PR branch for the reusable action: https://github.com/alphagov/govuk-infrastructure/actions/runs/9716231768/job/26819399056#step:3:31
#1361