Add new Dockerfile for prod

Dockerfile.prod

@@ -0,0 +1,18 @@
+FROM python:alpine
+ENV PYTHONUNBUFFERED 1
+ENV IS_DOCKER 0
+WORKDIR /app
+COPY requirements.txt ./
+COPY requirements-production.txt ./
+
+RUN apk add --no-cache --virtual .build-deps build-base linux-headers \
+    && apk add --no-cache jpeg-dev zlib-dev postgresql-dev \
+    && pip install -r requirements.txt \
+    && pip install -r requirements.production.txt \
+    && apk del .build-deps
+
+COPY . ./
+COPY sikweb/settings-sample-prod.py settings.py
+
+ENTRYPOINT ["sh", "-c", "echo 'Django running on http://localhost:8000 in production mode' \
+    && gunicorn -w 4 -b 0.0.0.0:8000 web20-backend.wsgi"]