removed installation logs

postgresql/Dockerfile

 FROM postgres:9.6
 
+RUN rm -rf /var/log/*
+
 COPY ./docker-entrypoint-initdb.d/ /docker-entrypoint-initdb.d

roundcube/Dockerfile

         php5-intl\
         php5-ldap\
         php5-imap &&\
-        apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* &&\
-        /usr/sbin/a2enmod rewrite &&\
-        rm -rf /var/www/html &&\
-        mkdir -p /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html &&\
-        chown -R www-data:www-data /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html &&\
-        ln -sf /dev/stderr /var/log/apache2/error.log &&\
-        ln -sf /dev/stdout /var/log/apache2/access.log
+        apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN /usr/sbin/a2enmod rewrite &&\
+    rm -rf /var/www/html &&\
+    mkdir -p /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html &&\
+    chown -R www-data:www-data /var/lock/apache2 /var/run/apache2 /var/log/apache2 /var/www/html
+
+RUN rm -rf /var/log/* &&\
+    mkdir -p /var/log/apache2 &&\
+    ln -s /dev/stderr /var/log/apache2/error.log &&\
+    ln -s /dev/stdout /var/log/apache2/access.log &&\
+    ln -s /dev/stdout /var/log/apache2/other_vhosts_access.log
 
 COPY ./apache2.conf /etc/apache2/apache2.conf
 
-COPY run.sh /run.sh
+COPY ./run.sh /run.sh
 
 EXPOSE 80