Broke due to a timeout and Timo does not like broken tests.
Less testing means less failing tests.

Also, hopefully sytest is less broken now.

Proper chmod caddy and conduit binaries

The final container tried to COPY from the default cargo target dir, but we only checked if cached_target is present.
We copy from cached_target to target when cached_target is present now in the builder

As the docker ignore file includes the target dir, content in this dir
is no accessible to the docker daemon.
We circumvent this by providing the build artifact in a dir called
cached_dir

TIL body.device_id != (*body).device_id, which is pretty bad, so I
renamed body.device_id to body.sender_device

ARGs contain secrets to speed up builds