[pkg] Fix up multi-stage Dockerfile

. Stop installing geoipupdate in first stage
. Remove apt package lists when finished to reduce size
. Remove bash tricks done for reducing layer sizes, they are removed due to
multi-stage
. Replace RUN mkdir with WORKDIR
. Install ca-certificatges in second stage, as its needed to authenticate the
remote server the geoip database is pulled from
. Switch to RUN cp for the GEOIP.conf.default
. Run geoipupdate in second stage to seed the database, without it, getmyip will
fail to start

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