Update drone.yml

drone.yml

   commands:
     - mkdir -p /var/cache/apt/archives
     - cp -rp .cache/ /var/cache/apt/archives/
+    - ls -l /var/cache/apt/archives
     - echo 'Acquire::http { Proxy "http://172.17.0.1:3142"; }' | tee -a /etc/apt/apt.conf.d/proxy
     - apt-get update
     - apt-get --yes upgrade
     - apt-get --yes install $BUILDDEPS
     - cp -rp /var/cache/apt/archives .cache/
+    - ls -l .cache
     - export MAKEFLAGS
     - make -C src
     - make -C src/contrib