Add requirements.production.txt, document it.

Dockerfile.web

@@ -36,11 +36,12 @@ ENV PATH /tenants2/node_modules/.bin:$PATH
 
 ENV NODE_ENV=production
 
-COPY Pipfile* /tmp/tenants2/
+COPY Pipfile* requirements.production.txt /tmp/tenants2/
 
 WORKDIR /tmp/tenants2
 
-RUN pipenv install --system --keep-outdated
+RUN pipenv install --system --keep-outdated \
+  && pip install -r requirements.production.txt
 
 WORKDIR /tenants2
 

README.md

@@ -45,6 +45,35 @@ python manage.py runserver
 
 Then visit http://localhost:8000/ in your browser.
 
+### Production dependencies
+
+Some of this project's dependencies are cumbersome
+to install on some platforms, so they're not installed
+by default.
+
+However, they are present in the Docker development
+environment (described below), and they are
+required to develop some functionality, as well as
+for production deployment. They can be installed via:
+
+```
+pipenv run pip install -r requirements.production.txt
+```
+
+These dependencies are described below.
+
+#### WeasyPrint
+
+[WeasyPrint][] is used for PDF generation. If it's
+not installed during development, then any PDF-related
+functionality will fail.
+
+Instructions for installing it can be found on the
+[WeasyPrint installation docs][].
+
+[WeasyPrint]: http://weasyprint.org/
+[WeasyPrint installation docs]: https://weasyprint.readthedocs.io/en/latest/install.html
+
 ## Running tests
 
 To run the back-end Python/Django tests, use:

requirements.production.txt

@@ -0,0 +1 @@
+WeasyPrint==0.42.3

update.sh

@@ -8,6 +8,7 @@ find . | grep -E "(__pycache__|\.pyc|\.pyo$)" | xargs rm -rf
 
 echo "----- Updating Python Dependencies -----"
 pipenv install --dev --keep-outdated
+pip install -r requirements.production.txt
 
 echo "----- Updating Node Dependencies -----"
 npm install --no-save