With the update to diesel 2.0.0-rc0, it is now possible to cross-compile
without emulation. Note that during each (cross)compile, we have to
install libpq-dev for the target platform, as only one version can be
installed at a time (e.g. libpq-dev:amd64 conflicts with libpq-dev:armhf).
This makes it possible to use the config examples with Docker Compose
(where every service has its own hostname) and to use it for packaging
(where by default the services are running under localhost).
