Dockerfile: builder user should own /srv by default
The normal operation of COSA is to bind mount in /srv. However, if
builds are done with out bind mounting in a replacement /srv, then you
have run `sudo`.
@@ -14,6 +14,7 @@ RUN ./build.sh configure_user
# clean up scripts (it will get cached in layers, but oh well)
WORKDIR /srv/
+RUN chown builder: /srv
RUN rm -rf /root/containerbuild
# allow writing to /etc/passwd from arbitrary UID
