remove charset from mimetype for check #307

Job	Run time
lint-test	15s
build-push-base / build-push-ar	3m 4s
Find docker images needing built	2s
build-push (examples/ffmpeg/Dockerfile) / build-push-ar	53s
build-push (examples/curl/Dockerfile) / build-push-ar	35s
build-push (examples/cache-warmer/Dockerfile) / build-push-ar	46s
build-push (examples/fits/Dockerfile) / build-push-ar	27s
build-push (examples/hls/Dockerfile) / build-push-ar	52s
build-push (examples/imagemagick/Dockerfile) / build-push-ar	1m 4s
build-push (examples/libreoffice/Dockerfile) / build-push-ar	1m 52s
build-push (examples/openai-htr/Dockerfile) / build-push-ar	52s
build-push (examples/pandoc/Dockerfile) / build-push-ar	2m 35s
build-push (examples/parry/Dockerfile) / build-push-ar	39s
build-push (examples/tesseract/Dockerfile) / build-push-ar	57s
build-push (examples/whisper/Dockerfile) / build-push-ar	2m 17s
build-push-dependencies (examples/mergepdf/Dockerfile) / build-push-ar	54s
build-push-dependencies (examples/coverpage/Dockerfile) / build-push-ar	3m 3s
build-push-dependencies (examples/ocrpdf/Dockerfile) / build-push-ar	1m 7s
Integration tests	2m 37s
	24m 51s

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