fix: add uploads directory back

Author: mrjvs

juxtaposition-ui.Dockerfile

@@ -13,6 +13,8 @@ WORKDIR ${app_dir}/apps/miiverse-api
 RUN npm run build
 
 WORKDIR ${app_dir}/apps/juxtaposition-ui
+# Multer uses the uploads directory for temporary files
+RUN mkdir -p uploads && chown node:node uploads
 RUN npm run build
 
 ENV NODE_ENV=production