Add HEIC support to nextcloud

From https://eplt.medium.com/5-minutes-to-install-imagemagick-with-heic-support-on-ubuntu-18-04-digitalocean-fe2d09dcef1

sudo sed -Ei 's/^# deb-src /deb-src /' /etc/apt/sources.list
sudo apt-get update
sudo apt-get install build-essential autoconf libtool git-core
sudo apt-get build-dep imagemagick libmagickcore-dev libde265 libheif
cd /usr/src/ 
sudo git clone https://github.com/strukturag/libde265.git  
sudo git clone https://github.com/strukturag/libheif.git 
cd libde265/ 
sudo ./autogen.sh 
sudo ./configure 
sudo make  
sudo make install 
cd /usr/src/libheif/ 
sudo ./autogen.sh 
sudo ./configure 
sudo make  
sudo make install 
cd /usr/src/ 
sudo wget https://www.imagemagick.org/download/ImageMagick.tar.gz 
sudo tar xf ImageMagick.tar.gz 
cd ImageMagick-7*
sudo ./configure --with-heic=yes 
sudo make  
sudo make install  
sudo ldconfig

sudo apt install php-imagick
cd /usr/src/ 
wget http://pecl.php.net/get/imagick-3.4.4.tgz
tar -xvzf imagick-3.4.4.tgz
cd imagick-3.4.4/
apt install php7.2-dev
phpize
./configure
make
make install
sudo phpenmod imagick

A restart of apache2 should finish the job. Check with the phpinfo() call…

sudo systemctl restart apache2
php -r 'phpinfo();' | grep HEIC
You should see:
ImageMagick supported formats => 3FR, 3G2, 3GP, A, AAI, AI, ART, ARW, AVI, AVS, B, BGR, BGRA, BGRO, BIE, BMP, BMP2, BMP3, BRF, C, CAL, CALS, CANVAS, CAPTION, CIN, CIP, CLIP, CMYK, CMYKA, CR2, CRW, CUBE, CUR, CUT, DATA, DCM, DCR, DCRAW, DCX, DDS, DFONT, DJVU, DNG, DPX, DXT1, DXT5, EPDF, EPI, EPS, EPS2, EPS3, EPSF, EPSI, EPT, EPT2, EPT3, ERF, EXR, FAX, FILE, FITS, FLV, FRACTAL, FTP, FTS, G, G3, G4, GIF, GIF87, GRADIENT, GRAY, GRAYA, GROUP4, HALD, HDR, HEIC,...