Resolve "Single sign off"

Closes #15 (closed)

logout_provider/Dockerfile

+FROM python:3.7-alpine
+
+RUN apk add gcc libc-dev libffi-dev
+
+WORKDIR /usr/src/app
+
+COPY requirements.txt ./
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+ARG FLASK_PORT=5002
+
+EXPOSE $FLASK_PORT
+
+ENV FLASK_ENV production
+ENV FLASK_RUN_PORT $FLASK_PORT
+ENV FLASK_RUN_HOST 0.0.0.0
+ENV HYDRA_ADMIN_URL http://localhost:4445
+
+
+CMD [ "flask", "run" ]