Add `--break-system-packages` to fix sphinx image #214

Job	Run time
build-and-push-image (alpine)	49s
build-and-push-image (clang-tools)	1m 38s
build-and-push-image (cpp)	3m 53s
build-and-push-image (package)	21s
build-and-push-image (qt)	2m 22s
build-and-push-image (snap)	1m 53s
build-and-push-image (docker-cli)	13s
build-and-push-image (sphinx)	12m 39s
	23m 48s

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