Merge branch 'fix/alpine-to-slim' into 'master'

Changed image base to slim

See merge request !4

Dockerfile.dev

-FROM python:3.6-alpine
+FROM python:3.8-slim
 
 ENV PYTHONUNBUFFERED=1
-ENV CONFIG_FILE=/code/config.yaml
+ENV CONFIG_FILE=/backend/config.yaml
 ENV PIP_NO_CACHE_DIR=false
 
-RUN apk add gcc python3-dev musl-dev postgresql-dev zlib-dev jpeg-dev libpq &&\
-    pip install pipenv
+RUN pip install pipenv
 
-WORKDIR /code
+WORKDIR /backend
 
-COPY Pipfile Pipfile.lock /code/
+COPY Pipfile Pipfile.lock /backend/
 RUN pipenv install --system --dev
 
-COPY . /code/
+COPY . /backend/
 
 ENTRYPOINT ["sh", "docker-entrypoint.sh"]