Publish docker images of the node and the client

[clangenb]

I wanted to use the binaries from here for the integration tests in the encointer-wallet. However, the integration tests there run on MacOS machines, which means our binaries do not work there.

[clangenb]

Alternatively, we can also just build for Mac machines in the CI because I am uncertain if our python libs can just execute docker images instead of the binary.

[clangenb]

We could also prepare a docker image that contains the python scripts and the encointer-client, so we can bootstrap a community from within the docker image.

[clangenb]

@mosonyi thinks docker is easy. So I think we should have two docker images:

1. the encointer-node as usual.
2. The encointer-client. It needs inside:

   encointer-client-notee
   client/py_client
   client/bootstrap_demo_community.py
   client/cli.py
   client/test-data

   And the entry points should be:

[./encointer-client-notee]
[./client/bootstrap_demo_community.py --client encointer-client-notee]
[./client/cli.py --client  encointer-client-notee]

[clangenb]

Install python deps: https://github.com/encointer/encointer-node/blob/master/scripts/install_python_deps.sh

[mosonyi]

@clangenb client is ready to test. Usage: docker run -it encointer/encointer-client-notee: [encointer-client-notee|bootstrap_demo_community.py|cli.py] Example: $ docker run -it encointer/encointer-client-notee:0.0.2 encointer-client-notee --version

[mosonyi]

@clangenb the node is added too example: docker run -it encointer/encointer-node-notee:0.0.2 --help

Please edit the Readme accordingly

[clangenb]

Done #293.

Thanks a lot, it works like a charm!