Cleanup caches at the end of the build

Dockerfile

@@ -2,7 +2,7 @@ FROM alpine:3.8
 
 LABEL com.example.vendor="LakeDrops" \
       maintainer="juergen.haas@lakedrops.com" \
-      version="1.5.1" \
+      version="1.5.2" \
       description="An image for GitLab runner to build and test Drupal projects."
 
 ARG ALPINE_VERSION
@@ -94,7 +94,10 @@ RUN echo 'hosts: files dns' > /etc/nsswitch.conf && \
     ln -s /usr/local/bin/ahoy /usr/local/bin/a && \
     ln -s /usr/local/bin/composer /usr/local/bin/c && \
     ln -s /usr/local/bin/docker-compose /usr/local/bin/d-c && \
-    ln -s /usr/local/bin/drush /usr/local/bin/d
+    ln -s /usr/local/bin/drush /usr/local/bin/d && \
+    \
+    rm -rf /var/cache/* && \
+    rm -rf /root/.composer/cache
 
 ADD bin/* /usr/local/bin/
 
@@ -102,4 +105,3 @@ ENV LAKEDROPS_DEV_DC_OPTIONS "-T"
 
 ENTRYPOINT ["docker-entrypoint.sh"]
 CMD ["sh"]
-