update to buster, php 7-4, and omeka 2.1.0

Dockerfile

@@ -1,4 +1,4 @@
-FROM php:apache-stretch
+FROM php:7.4-apache-buster
 
 # Omeka-S web publishing platform for digital heritage collections (https://omeka.org/s/)
 # Previous maintainers: Oldrich Vykydal (o1da) - Klokan Technologies GmbH  / Eric Dodemont <eric.dodemont@skynet.be>
@@ -23,13 +23,13 @@ RUN apt-get -qq update && apt-get -qq -y --no-install-recommends install \
     ghostscript
 
 # Install the PHP extensions we need
-RUN docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/
+RUN docker-php-ext-configure gd --with-jpeg=/usr/include/ --with-freetype=/usr/include/
 RUN docker-php-ext-install -j$(nproc) iconv pdo pdo_mysql mysqli gd
-RUN yes | pecl install  mcrypt-1.0.2 && docker-php-ext-enable mcrypt && yes | pecl install imagick && docker-php-ext-enable imagick 
+RUN yes | pecl install  mcrypt-1.0.3 && docker-php-ext-enable mcrypt && yes | pecl install imagick && docker-php-ext-enable imagick 
 
 # Add the Omeka-S PHP code
 # Latest Omeka version, check: https://omeka.org/s/download/
-RUN wget --no-verbose "https://github.com/omeka/omeka-s/releases/download/v2.0.2/omeka-s-2.0.2.zip" -O /var/www/latest_omeka_s.zip
+RUN wget --no-verbose "https://github.com/omeka/omeka-s/releases/download/v2.1.0/omeka-s-2.1.0.zip" -O /var/www/latest_omeka_s.zip
 RUN unzip -q /var/www/latest_omeka_s.zip -d /var/www/ \
 &&  rm /var/www/latest_omeka_s.zip \
 &&  rm -rf /var/www/html/ \