#8 Cleanup caches after build

Dockerfile

@@ -17,4 +17,7 @@ RUN echo "Install dorgflow" && \
     git clone https://github.com/joachim-n/dorgflow.git && \
     cd dorgflow && \
     composer install --no-dev && \
-    ln -s /var/opt/dorgflow/dorgflow /usr/local/bin/dorgflow
+    ln -s /var/opt/dorgflow/dorgflow /usr/local/bin/dorgflow && \
+    \
+    rm -rf /var/cache/* && \
+    rm -rf /root/.composer/cache