Update Dockerfile

latest/Dockerfile

@@ -1,10 +1,12 @@
-
 FROM luki42/latex-full:static
 MAINTAINER luki42
 
 # set up packages
 RUN tlmgr update --self && \
-    tlmgr update --all
+    tlmgr update --all && \
+    rm -rf /var/lib/apt/lists/* \
+       /tmp/* \
+       /var/tmp/*
 
 
 # Expose /home as workin dir