I followed the documention for theming (using the theming app) and installed imagick.
In my dockerfile:
RUN apt-get update && apt-get install -y
RUN pecl install imagick
RUN docker-php-ext-enable imagick
That works fine and I get cool favicons. However, I read that thumbnail generation in nextcloud is dangerous with that provider. Did it get enabled? I don’t see thumbnails for my svg in my files, so I suspect it is ok, but I want to make sure!