Add pecl before mongo install

Author: nunomazer

workspace/Dockerfile-56

@@ -189,6 +189,7 @@ ARG INSTALL_MONGO=false
 ENV INSTALL_MONGO ${INSTALL_MONGO}
 RUN if [ ${INSTALL_MONGO} = true ]; then \
     # Install the mongodb extension
+    pecl channel-update pecl.php.net && \
     pecl install mongodb && \
     echo "extension=mongodb.so" >> /etc/php/5.6/mods-available/mongodb.ini && \
     ln -s /etc/php/5.6/mods-available/mongodb.ini /etc/php/5.6/cli/conf.d/30-mongodb.ini \