attempt to perform an operation not allowed by the security policy `PDF'

[a4i]

Running a 10.10 nuxeo instance with this docker image, I get this exception :

nuxeo_1          | Caused by: org.nuxeo.ecm.platform.commandline.executor.api.CommandException: Error code 1 return by command: convert -define registry:temporary-path=#{nuxeo.tmp.dir} -quiet -strip -thumbnail #{size} -background transparent -gravity center -format png -quality 75 #{inputFilePath}[0] #{outputFilePath}
nuxeo_1          | convert-im6.q16: attempt to perform an operation not allowed by the security policy `PDF' @ error/constitute.c/IsCoderAuthorized/408.
nuxeo_1          |   convert-im6.q16: no images defined `/opt/nuxeo/server/tmp/nxblob-1914293338314100812.png' @ error/convert.c/ConvertImageCommand/3258.

nuxeo_1          | 2020-10-25T09:38:20,106 WARN  [ThumbnailDocumentFactory] Cannot compute document thumbnail
nuxeo_1          | org.nuxeo.ecm.core.convert.api.ConversionException: Thumbnail conversion failed
nuxeo_1          | 	at org.nuxeo.ecm.platform.thumbnail.converter.ThumbnailDocumentConverter.convert(ThumbnailDocumentConverter.java:88) ~[nuxeo-thumbnail-10.10-HF18.jar:?]

I had to modify /etc/ImageMagick-6/policy.xml in the docker image this way, to have Nuxeo compute his thumbnails :

    <policy domain="coder" rights="none" pattern="XPS" />
+   <policy domain="coder" rights="read | write" pattern="PDF" />
  </policymap>

regards