Add docker container configuration for server

docker/playlistcast_server/Dockerfile

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+FROM python:3.7.6-alpine3.11
+MAINTAINER michal@vane.pl
+RUN apk add --no-cache git build-base
+ADD . /install
+RUN git clone https://github.com/vane/tornadoql /vendor/tornadoql
+RUN pip install -r /install/requirements.py37.txt

docker/playlistcast_server/requirements.py37.txt

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+aiocron==1.3
+aniso8601==3.0.2
+astroid==2.3.3
+beautifulsoup4==4.8.2
+bs4==0.0.1
+casttube==0.2.0
+certifi==2019.11.28
+chardet==3.0.4
+coverage==5.0.3
+croniter==0.3.31
+graphene==2.1.8
+graphene-sqlalchemy==2.2.2
+graphql-core==2.3.1
+graphql-relay==2.0.1
+http-parser==0.4.1
+idna==2.8
+ifaddr==0.1.6
+isort==4.3.21
+lazy-object-proxy==1.4.3
+mccabe==0.6.1
+promise==2.3
+protobuf==3.11.3
+PyChromecast==4.1.1
+pylint==2.4.4
+pymediainfo==4.1
+python-dateutil==2.8.1
+pytz==2019.3
+requests==2.22.0
+Rx==1.6.1
+singledispatch==3.4.0.3
+six==1.14.0
+soupsieve==1.9.5
+SQLAlchemy==1.3.13
+tornado==6.0.3
+typed-ast==1.4.1
+tzlocal==2.0.0
+urllib3==1.25.8
+wrapt==1.11.2
+zeroconf==0.24.4
+vendor/tornadoql