Add required packages for wkhtmltopdf and xvfb to Dockerfile

Dockerfile

@@ -13,7 +13,7 @@ RUN echo "Updating repostitories..." && \
     echo "Upgrading base debian system..." && \
     apt-get upgrade -y && \
     echo "Installing alexia required packages..." && \
-    apt-get install -y apt-utils git net-tools python3 python3-pip mariadb-client libmariadb-dev xmlsec1 libssl-dev libldap-dev libsasl2-dev libjpeg-dev zlib1g-dev gettext locales acl && \
+    apt-get install -y apt-utils git net-tools python3 python3-pip mariadb-client libmariadb-dev xmlsec1 libssl-dev libldap-dev libsasl2-dev libjpeg-dev zlib1g-dev gettext locales acl wkhtmltopdf xvfb && \
     echo "Enabling 'nl_NL' and 'en_US' locales..." && \
     sed -i -e 's/# nl_NL.UTF-8 UTF-8/nl_NL.UTF-8 UTF-8/' /etc/locale.gen && \
     sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen && \