Add official Docker image

[LNow]

Is your feature request related to a problem? Please describe.
Some users might not want to install whole Node stack in order to run bot. Or they would like to run bot in containerized environment.

Describe the solution you'd like
Create official Docker image that will work for everyone.

Describe alternatives you've considered
none

Additional context
Right now I'm using something like this:

FROM node:alpine3.12
RUN apk add --no-cache git procps

WORKDIR /usr/src/app
RUN git clone https://github.com/Daemon-Technologies/Mining-Bot . 
RUN yarn install

CMD ["npm", "start"]

Unfortunately due to large number of dependencies and not being able to build it with yarn install --prod final image size is ~1.7GB.