remove unused dockerfile

docker-setup/Dockerfile

-FROM alpine:3.8
-
-# Build arguments
-## The database user name
-ARG DBUSER
-## The user's password
-ARG DBPASS
-## The database name
-ARG DBNAME
-
-
-# Forward the args to the container
-ENV DBUSER=${DBUSER}
-ENV DBPASS=${DBPASS}
-ENV DBNAME=${DBNAME}
-
-ENV PGDATA "/var/lib/postgresql"
-
-RUN apk update && \
-    apk add postgresql postgresql-contrib
-
-RUN mkdir -p /run/postgresql && chmod a+w /run/postgresql
-
-ADD entrypoint.sh /entrypoint.sh
-RUN chmod +x /entrypoint.sh
-USER postgres
-
-VOLUME $PGDATA
-CMD ["/entrypoint.sh"]
-EXPOSE 5432