Run Sphinx build during docker image build

Dockerfile

@@ -65,6 +65,9 @@ COPY website /usr/src/app/website/
 # Copy files for Sphinx documentation
 COPY README.md /usr/src/app/
 COPY docs /usr/src/app/docs
+RUN sphinx-build -c /usr/src/app/docs/ /usr/src/app/docs/ /usr/src/app/docs/_build && \
+    tar --create --xz --file=/usr/src/app/docs.tar.xz --directory=/usr/src/app/docs/_build/ . && \
+    rm --recursive /usr/src/app/docs/
 
 # Cache docs between builds if not mounting to FS
 VOLUME /concrexit/docs

resources/entrypoint_production.sh

@@ -2,17 +2,15 @@
 
 set -e
 
->&2 echo "Creating Sphinx documentation"
-sphinx-build -b html /usr/src/app/docs/ /concrexit/docs/
+tar --extract --xz --file=/usr/src/app/docs.tar.xz --directory=/concrexit/docs/
+chown -R www-data:www-data /concrexit/
 
-until psql -h "$DJANGO_POSTGRES_HOST" -U "postgres" -c '\l' $POSTGRES_DB; do
+until psql -h "$DJANGO_POSTGRES_HOST" -U "postgres" -c '\l' "$POSTGRES_DB"; do
     >&2 echo "PostgreSQL is unavailable: Sleeping"
     sleep 5
 done
 >&2 echo "PostgreSQL is up"
 
-chown -R www-data:www-data /concrexit/
-
 cd /usr/src/app/website/
 >&2 echo "Running site with uwsgi"
 uwsgi --chdir /usr/src/app/website \