additional package requirements

[mayeulk]

In addition to #5
I ran into the following errors:
debconf: delaying package configuration, since apt-utils is not installed
So I suggest adding apt-utils. However, the warning is non-blocking according to: phusion/baseimage-docker#319

Also:

configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers.
checking for pkg-config... no
pkg-config not found
configure: error: Please reinstall the pkg-config distribution
ERROR: Service 'app-zotero' failed to build:
Step 17/39 : RUN DEBIAN_FRONTEND=noninteractive pecl download memcached-3.0.4 && tar xvzf memcached-3.0.4.tgz && cd memcached-3.0.4 && phpize && ./configure --enable-memcached-igbinary && make && make install
 ---> Running in 37ecab268d95
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update