[QA] docker images have no support for PDF or SVG preview providers about core HOT 8 CLOSED

Maybe today: We could not find an imagick package with heic support in ubuntu 20.04, when we had to add this to our docker. Then we decided to build our own.

Probably the docker images should be rebased to something much newer (php-7.4 🙈 ), but that was not the plan at that time ...

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We deployed fixed docker images for 10.13.4 and 10.14.0. Please try e.g.

docker pull owncloud/server:10.14.0
docker run --rm -ti -p 8080:8080 -e 'OWNCLOUD_ENABLED_PREVIEW_PROVIDERS=OC\Preview\PDF,OC\Preview\SGI,OC\Preview\Heic,OC\Preview\PNG,OC\Preview\JPEG,OC\Preview\WEBP,OC\Preview\GIF,OC\Preview\BMP,OC\Preview\XBitmap,OC\Preview\MP3,OC\Preview\TXT,OC\Preview\MarkDown,OC\Preview\SVG'  owncloud/server:10.14.0

Confirmed fixed. All kinds of previews work nicely for me.

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there is a config file with imagick where formats can be enabled ...

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https://stackoverflow.com/questions/52998331/imagemagick-security-policy-pdf-blocking-conversion

from core.

Added details to owncloud/docs-server#1269

Tested both cases: imagick with and without compiled PDF support. Editing the policy.xml only helps in the first case.

from core.

I never had to compile imagick extension myself .... one day I need to understand why you do this ...

from core.

This is already documented: https://doc.owncloud.com/server/next/admin_manual/configuration/files/previews_configuration.html#notes-for-pdf-preview-generation

from core.

Shouldn't this go to https://github.com/owncloud-docker/server/issues as this doesn't look ownCloud server specific but Docker image specific as these just don't provide the required support like stated in owncloud/docs-server#1269:

E.g.: Currently our docker image have an imagick that neither supports SVG nor PDF.

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