Generate CI Images #289

Job	Run time
build_images (mri-3.3)	1m 34s
build_images (mri-4.0)	1m 26s
build_images (mri-3.4)	1m 25s
build_images (alpine)	1m 39s
build_images (ubuntu)	1m 18s
build_images (upstream-libxml)	1m 32s
build_images (mri-3.2)	1m 45s
	10m 39s

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