[minor] Add jp2 support (#37) #182

Job	Run time
lint-test	9s
build-push-base / build-push-ar	53s
Find docker images needing built	3s
build-push (examples/cache-warmer/Dockerfile) / build-push-ar	28s
build-push (examples/fits/Dockerfile) / build-push-ar	22s
build-push (examples/curl/Dockerfile) / build-push-ar	23s
build-push (examples/ffmpeg/Dockerfile) / build-push-ar	31s
build-push (examples/libreoffice/Dockerfile) / build-push-ar	1m 2s
build-push (examples/imagemagick/Dockerfile) / build-push-ar	46s
build-push (examples/pandoc/Dockerfile) / build-push-ar	38s
build-push (examples/tesseract/Dockerfile) / build-push-ar	44s
build-push-dependencies (examples/coverpage/Dockerfile) / build-push-ar	33s
Integration tests	52s
	7m 24s

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