Remove apt trash

Dockerfile

@@ -27,7 +27,8 @@ RUN chmod 0600 /opt/keys/*; \
     sed -i 's#;listen.mode = 0660#listen.mode = 0777#g' /etc/php/7.0/fpm/pool.d/www.conf; \
     sed -i 's#pm.max_children = 5#pm.max_children = 10#g' /etc/php/7.0/fpm/pool.d/www.conf; \
     sed -i 's#;pm.max_requests = 500#pm.max_requests = 500#g' /etc/php/7.0/fpm/pool.d/www.conf; \
-    chmod 777 -R var/cache/ var/logs/ var/sessions/ 
+    chmod 777 -R var/cache/ var/logs/ var/sessions/; \
+    rm -rf /var/lib/apt/lists/*
 
 CMD rm var/cache/* -rf ;\
     composer run-script post-install-cmd --no-interaction ;\