[Docker] Move collectstatic to entrypoint script

This is needed because when updating an existing environment, the
existing volume will shadow away the changes done on container build.

Dockerfile

@@ -42,8 +42,7 @@ RUN mkdir -p /var/lib/biscuit/media /var/lib/biscuit/static /var/lib/biscuit/bac
 
 # Build messages and assets
 RUN python manage.py compilemessages; \
-    python manage.py yarn install; \
-    python manage.py collectstatic --no-input --clear
+    python manage.py yarn install
 
 # Clean up build dependencies
 RUN apt-get remove --purge -y \
@@ -57,7 +56,6 @@ RUN apt-get remove --purge -y \
     pip uninstall -y poetry; \
     rm -f /var/lib/apt/lists/*_*; \
     rm -rf /root/.cache; \
-    rm -rf biscuit/node_modules; \
     rm -rf /usr/local/lib/node_modules
 
 # Declare a persistent volume for all data

docker/entrypoint.sh

@@ -19,6 +19,7 @@ done
 
 python manage.py flush --no-input
 python manage.py migrate
+python manage.py collectstatic --no-input --clear
 
 if [[ -n "$@" ]]; then
     exec "$@"