placeholder values for collectstatic

Dockerfile

@@ -11,7 +11,12 @@ COPY . .
 RUN pip install -r requirements/base.txt -r requirements/prod.txt
 RUN npm install
 RUN npm run build
-RUN python manage.py collectstatic --noinput --settings=rybicka.settings.prod
+
+# Placeholder values so the static files collect
+RUN DATABASE_URL=postgres://x/x \
+    SECRET_KEY=x \
+    ALLOWED_HOSTS=x \
+    python manage.py collectstatic --noinput --settings=rybicka.settings.prod
 
 RUN bash -c "adduser --disabled-login --quiet --gecos app app &&  \
              chmod -R o+r /app/ && \