docker: use new debian, add data_url arg

[stephank]

Based on #240. Does this work for you @jimdigriz? I tried with and without data_url, and think it works as expected. Not sure if you had a specific need for the slim image variants?

Example output of docker image history:

IMAGE          CREATED             CREATED BY                                      SIZE      COMMENT
439b77868c37   About an hour ago   EXPOSE map[3333/tcp:{}]                         0B        buildkit.dockerfile.v0
<missing>      About an hour ago   ENV BROKER_LISTEN_IP=::                         0B        buildkit.dockerfile.v0
<missing>      About an hour ago   USER portier-broker                             0B        buildkit.dockerfile.v0
<missing>      About an hour ago   ENTRYPOINT ["/opt/portier-broker/portier-bro…   0B        buildkit.dockerfile.v0
<missing>      About an hour ago   WORKDIR /opt/portier-broker                     0B        buildkit.dockerfile.v0
<missing>      About an hour ago   COPY /data /opt/portier-broker # buildkit       14.5kB    buildkit.dockerfile.v0
<missing>      About an hour ago   COPY /build/target/release/portier-broker /o…   20.5MB    buildkit.dockerfile.v0
<missing>      About an hour ago   RUN /bin/sh -c set -x   && apt-get update   …   3.68MB    buildkit.dockerfile.v0
<missing>      About an hour ago   RUN /bin/sh -c set -x   && groupadd -r -g 99…   329kB     buildkit.dockerfile.v0
<missing>      8 days ago          /bin/sh -c #(nop)  CMD ["bash"]                 0B
<missing>      8 days ago          /bin/sh -c #(nop) ADD file:22ed184e421fcac77…   124MB

[jimdigriz]

Looks okay for what I need. I will not have the time to try this till the start of June, so if you wanted to just go ahead and merge this then do not let me hold you up. Thanks

[stephank]

Alright, I'll merge this now. We can continue discussing in #240. Thanks! 🙂