Download children images in parallel for merge PDF (#51) #257

Job	Run time
lint-test	45s
build-push-base / build-push-ar	1m 1s
Find docker images needing built	5s
build-push (examples/ffmpeg/Dockerfile) / build-push-ar	50s
build-push (examples/curl/Dockerfile) / build-push-ar	42s
build-push (examples/cache-warmer/Dockerfile) / build-push-ar	31s
build-push (examples/fits/Dockerfile) / build-push-ar	26s
build-push (examples/libreoffice/Dockerfile) / build-push-ar	1m 39s
build-push (examples/pandoc/Dockerfile) / build-push-ar	52s
build-push (examples/imagemagick/Dockerfile) / build-push-ar	42s
build-push (examples/parry/Dockerfile) / build-push-ar	32s
build-push (examples/tesseract/Dockerfile) / build-push-ar	1m 21s
build-push (examples/whisper/Dockerfile) / build-push-ar	3m 17s
build-push-dependencies (examples/ocrpdf/Dockerfile) / build-push-ar	1m 11s
build-push-dependencies (examples/mergepdf/Dockerfile) / build-push-ar	52s
build-push-dependencies (examples/coverpage/Dockerfile) / build-push-ar	35s
Integration tests	2m 38s
	17m 59s

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