Merge branch 'warmfix-dockerfile' into 'staging'

Add pandas dependency to Dockerfile

See merge request !128

backend/Dockerfile

 FROM python:3.8-alpine as builder
 
-RUN apk add --no-cache postgresql-dev gcc python3-dev musl-dev libffi-dev
+RUN apk add --no-cache postgresql-dev gcc g++ python3-dev musl-dev libffi-dev \
+    zlib-dev jpeg-dev
 
 WORKDIR /app/
 COPY requirements.txt ./
@@ -28,6 +29,4 @@ ENV DJANGO_SETTINGS_MODULE 'dblood.settings.production'
 ENV DEBUG 'False'
 ENV STATIC_URL '/api/static/'
 
-RUN ["python", "manage.py", "installtasks"]
-
 CMD ["gunicorn", "dblood.wsgi", "--bind", "0.0.0.0:8000"]