GitLab-CI: add build-docker job with slimming

Change-Id: If2b9d90d28e2637fab7aa6ea525feb446f6e05d4
diff --git a/Dockerfile b/Dockerfile
index b1da33b..cb329c2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -58,8 +58,9 @@
 
 # RUN MOJO_CONFIG=/derekovecs/example.conf hypnotoad -t script/derekovecs-server # Just do the Inlined::C stuff
 # does not work with slimming
-
-RUN rm -rf example-models /root/.perl-cpm
+RUN perl -p -i -e 's@"/example-models@"/derekovecs/example-models@' example-models/example-docker.conf
+RUN rm -rf example-models
+RUN rm -rf /root/.perl-cpm
 RUN rm /bin/cpm && \
     apk del git \
 #            g++ \