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[skip changelog]
Diff failure is because of the changes added to deal with perlmagick being installed now and it trying to shrink the 1x83 test image which fails. OTOH is now testing e.g. the static_map stitch code which it wasn't on Travis.
Tried using the perl version docker images, but had weird test failures (slim base builds? Couldn't work it out), so instead am using GitHub's default, perlbrew to install a specific version and caching that.