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Simplifies Dockerfile.a11y-regression, Dockerfile.visual-regression and Dockerfile.mediawiki
Uses smaller "FROM" base images
Preserves ability to run locally on ARM macOS machines (specifying the platform as
linux/amd64
explicitly keeps Rosetta happy)Faster Docker image builds on macOS as it no longer has to fetch and install Chromium .deb files
Tested on Intel arch Ubuntu box too