add PHP Archive module needed by the occ upgrade process

Add imagemagick support for dynamic icon generation.

Dockerfile

@@ -26,6 +26,7 @@ RUN \
  apk add --no-cache \
 	curl \
 	ffmpeg \
+	imagemagick \
 	libxml2 \
 	php7-apcu \
 	php7-bz2 \
@@ -37,6 +38,7 @@ RUN \
 	php7-gd \
 	php7-gmp \
 	php7-iconv \
+	php7-imagick \
 	php7-imap \
 	php7-intl \
 	php7-ldap \
@@ -48,6 +50,7 @@ RUN \
 	php7-pdo_pgsql \
 	php7-pdo_sqlite \
 	php7-pgsql \
+	php7-phar \
 	php7-posix \
 	php7-redis \
 	php7-sqlite3 \
@@ -75,6 +78,7 @@ RUN \
 	-e 's/;opcache.save_comments.*=.*/opcache.save_comments=1/g' \
 	-e 's/;opcache.revalidate_freq.*=.*/opcache.revalidate_freq=1/g' \
 	-e 's/;always_populate_raw_post_data.*=.*/always_populate_raw_post_data=-1/g' \
+	-e 's/memory_limit.*=.*128M/memory_limit=512M/g' \
 		/etc/php7/php.ini && \
  sed -i \
 	'/opcache.enable=1/a opcache.enable_cli=1' \