Remove apt trash

7_0/Dockerfile

@@ -21,4 +21,5 @@ RUN apt-get update; \
     ssh-keyscan -H -p 222 gogs.infra.flowdat.com >> ~/.ssh/known_hosts; \
     ssh-keyscan -H -p 222 infra.flowdat.com >> ~/.ssh/known_hosts; \
     ssh-keyscan -H -p 222 200.50.168.30 >> ~/.ssh/known_hosts; \
-    ssh-keyscan -H -p 22  bitbucket.org >> ~/.ssh/known_hosts
+    ssh-keyscan -H -p 22  bitbucket.org >> ~/.ssh/known_hosts; \
+    rm -rf /var/lib/apt/lists/*