Update

drone.yml

     repo: reg.unino.de/develop/debian-${DRONE_REPO_NAMESPACE}-${DRONE_REPO_NAME}
     #mirror: registry-1.docker.io
     bip: 172.17.0.1/16 # set bridge if non-existent
-    context: /drone # defaults to root of git repo
+    context: /drone/src # defaults to root of git repo
     #custom_dns: 127.0.0.11 # defaults to 8.8.8.8 and 8.8.4.4 
     storage_driver: overlay2 # aufs, overlay or vfs
     #debug: true