update drone.yml

drone.yml

   settings:
     registry: repo.unino.de
     insecure: false
-	#auth: authtoken
+    #auth: authtoken
     username:
       from_secret: reg-user
     password:
     repo: repo.unino.de/library/debian-devel
     #mirror: registry.hub.docker.com/library/busybox
 
-	dry_run: true
+    dry_run: true
 
 
     #bip: false
-	#context: /drone
+    #context: /drone
     #custom_dns:
     #storage_driver: aufs # aufs, overlay or vfs
 
 
     auto_tag: false
     auto_tag_suffix: linux-amd64
-	force_tag: true
+    force_tag: true
     tags:
       - latest
     build_args: