refact: base config not overwritable by aura#132

Dockerfile

@@ -21,7 +21,7 @@ RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 RUN mkdir -p /srv/src /srv/tests /srv/config srv/logs srv/socket /var/audio
 COPY src /srv/src
 COPY tests /srv/tests
-COPY config/sample.engine-core.docker.ini /etc/aura/engine-core.ini
+COPY config/sample.engine-core.docker.ini /srv/config/engine-core.ini
 COPY Makefile /srv/Makefile
 COPY VERSION /srv/VERSION