Set FILES to ensure proper order #256

Job	Run time
lint-test	25s
build-push-base / build-push-ar	43s
Find docker images needing built	3s
build-push (examples/curl/Dockerfile) / build-push-ar	40s
build-push (examples/cache-warmer/Dockerfile) / build-push-ar	44s
build-push (examples/fits/Dockerfile) / build-push-ar	29s
build-push (examples/ffmpeg/Dockerfile) / build-push-ar	51s
build-push (examples/imagemagick/Dockerfile) / build-push-ar	44s
build-push (examples/libreoffice/Dockerfile) / build-push-ar	1m 34s
build-push (examples/pandoc/Dockerfile) / build-push-ar	36s
build-push (examples/parry/Dockerfile) / build-push-ar	39s
build-push (examples/tesseract/Dockerfile) / build-push-ar	52s
build-push (examples/whisper/Dockerfile) / build-push-ar	2m 54s
build-push-dependencies (examples/ocrpdf/Dockerfile) / build-push-ar	59s
build-push-dependencies (examples/coverpage/Dockerfile) / build-push-ar	39s
build-push-dependencies (examples/mergepdf/Dockerfile) / build-push-ar	1m 7s
Integration tests	2m 30s
	16m 29s

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