Use qpdf for more consistent results #424

Job	Run time
lint-test	16s
build-push-base / build-push-ar	3m 41s
Find docker images needing built	4s
build-push (examples/cleanpdf/Dockerfile) / build-push-ar	44s
build-push (examples/ffmpeg/Dockerfile) / build-push-ar	49s
build-push (examples/curl/Dockerfile) / build-push-ar	40s
build-push (examples/cache-warmer/Dockerfile) / build-push-ar	56s
build-push (examples/fits/Dockerfile) / build-push-ar	1m 0s
build-push (examples/hls/Dockerfile) / build-push-ar	53s
build-push (examples/imagemagick/Dockerfile) / build-push-ar	1m 0s
build-push (examples/libreoffice/Dockerfile) / build-push-ar	1m 55s
build-push (examples/openai-htr/Dockerfile) / build-push-ar	58s
build-push (examples/pandoc/Dockerfile) / build-push-ar	2m 39s
build-push (examples/parry/Dockerfile) / build-push-ar	39s
build-push (examples/tesseract/Dockerfile) / build-push-ar	1m 6s
build-push (examples/whisper/Dockerfile) / build-push-ar	2m 21s
build-push-dependencies (examples/ocrpdf/Dockerfile) / build-push-ar	1m 0s
build-push-dependencies (examples/mergepdf/Dockerfile) / build-push-ar	1m 1s
build-push-dependencies (examples/coverpage/Dockerfile) / build-push-ar	3m 1s
Integration tests	2m 19s
	27m 2s

Provide feedback